Mayo Clinic Group Return
Rochester, MN · EIN 38-3952644 · Health care · Rank 8 by total revenue
Patient care, medical research and medical education
Money, Form 990 for tax year 2024
- Total revenue
- $14,891,458,272
- Total expenses
- $14,325,143,800
- Total assets
- $17,859,698,606
- Salary base (all salaries and wages)
- $4,947,465,507
- Salaries, other pay and benefits
- $6,424,890,223
- Employees
- 65,470
- Salary base per employee
- $75,568
"Salary base" is Form 990 Part IX lines 5 to 7. "Employees" is everyone who got a W-2 that year, full or part time. Form 990-EZ and 990-PF report pay differently; see About the data.
Leadership (223)
| Name | Title | Role | Hours/week | Total pay |
|---|---|---|---|---|
| Farrugia MD Gianrico | DIRECTOR/CEO/PRESIDENT | Board, Officer, Key employee | 40 | $4,888,096 |
| Thielen MD Kent R | DIRECTOR/CHAIR/CEO FL | Board, Officer, Key employee | 40 | $3,206,799 |
| Gray MD Richard J | DIR/CHAIR/CEO AZ/FORMER KEY | Board, Officer, Key employee | 40 | $3,202,023 |
| Williams MD Amy W | DIR/VICE CHAIR/EXEC DEAN OF PRACTICE | Board, Officer, Key employee | 40 | $2,328,769 |
| Zorn Christina K | DIR/CAO/FORMER OFFICER | Board, Officer, Key employee | 40 | $2,169,564 |
| Dahlen Dennis E | DIRECTOR/VP/FORMER OFFICER | Board, Officer | 40 | $1,990,254 |
| Murphy Joshua B | SECRETARY/ASST SECY | Officer | 40 | $1,838,681 |
| Gorman Paul A | TREASURER | Officer | 40 | $1,748,824 |
| Varkey Mbbs Prathibha | DIRECTOR/PRESIDENT MCHS | Board, Officer, Key employee | 40 | $1,500,603 |
| Menkosky Paula E | CHIEF HR OFFICER/FORMER OFFICER | Officer, Key employee | 40 | $1,262,312 |
| Didehban Roshanak | DIRECTOR/SECY/ASST TREAS | Board, Officer | 40 | $1,145,919 |
| Hebl MD James R | DIR/PRES/CHAIR/REGIONAL VP-SWMN | Board, Officer | 1 | $1,136,439 |
| Helmers MD Richard A | DIR/PRES/CHAIR/REGIONAL VP-NWWI | Board, Officer | 1 | $1,114,404 |
| Albright Jr DO Robert C | DIRECTOR/CHAIR/REGIONAL VP SEMN | Board, Officer | 1 | $1,017,652 |
| Noseworthy MD Peter A | DIRECTOR/PRESIDENT | Board, Officer | 1 | $980,033 |
| Rogers James A | DIRECTOR/ASST SECY | Board, Officer | 40 | $930,230 |
| Dunn Ajani N | DIR/SECY/ASST TREAS/CAO FL | Board, Officer | 40 | $915,625 |
| Caine Natalie A | DIRECTOR/SECY | Board, Officer | 1 | $870,057 |
| Chapital MD Alyssa B | DIRECTOR/VICE CHAIR | Board, Officer | 40 | $795,813 |
| McLaughlin MD Sarah A | DIRECTOR/VICE CHAIR | Board, Officer | 40 | $775,519 |
| Brown MD Daniel R | DIRECTOR/CHAIR | Board, Officer | 1 | $771,089 |
| Anil MD Gokhan | DIRECTOR/VICE CHAIR | Board, Officer | 40 | $757,811 |
| Horst Adam M | DIR/TREAS/CFO ROCHESTER | Board, Officer, Key employee | 40 | $723,678 |
| Jensen MD Jeffrey B | DIRECTOR/CHAIR | Board, Officer | 1 | $711,991 |
| Cullinan MD Susan M | DIRECTOR/FORMER OFFICER | Board, Officer | 40 | $692,655 |
| Francis James R | DIRECTOR/ASST TREASURER | Board, Officer | 40 | $677,056 |
| Wilson James D | CFO MCHS | Officer | 40 | $653,841 |
| Sherrill Todd E | DIR/ASST SECY/ASST TREAS/FORMER OFFICER | Board, Officer | 40 | $638,975 |
| Hasse Christopher H | DIR/CAO MCHS/ASST SECY | Board, Officer, Key employee | 40 | $589,885 |
| Rigdon Alice W | DIRECTOR/TREASURER/CFO FL | Board, Officer | 40 | $580,994 |
| Harper Jr MD Charles M | DIR/FORMER OFFICER/FORMER KEY | Board, Officer, Key employee | 1 | $570,507 |
| Peck MD Robert C | DIRECTOR/VICE CHAIR | Board, Officer | 40 | $560,117 |
| Viramontes Allison L | DIRECTOR/TREASURER/CFO AZ | Board, Officer | 40 | $558,914 |
| Glenn Sean W | DIRECTOR/ASST SECY | Board, Officer | 40 | $548,277 |
| Ezenagu MD Leonard C | DIRECTOR/SECY | Board, Officer | 40 | $523,177 |
| Holtan Douglas J | DIRECTOR/FORMER OFFICER | Board, Officer | 1 | $516,035 |
| Mueller MD Paul S | DIRECTOR/CHAIR/REGIONAL VP-SWWI | Board, Officer | 1 | $513,277 |
| Hubert Sherry L | ASST SECY | Officer | 40 | $496,882 |
| Pignolo MD PHD Robert J | DIRECTOR/VICE CHAIR | Board, Officer | 1 | $493,702 |
| Ackerman Franklin K | DIR/VP/REG CHAIR ADMIN NWWI/FORMER KEY | Board, Officer, Key employee | 40 | $473,679 |
| Goldman Daniel S | ASST SECY | Officer | 40 | $456,107 |
| Miller Rick R | DIR/TREAS/ASST TREAS/CFO MN | Board, Officer | 40 | $437,459 |
| Bortnem Mark A | DIRECTOR/TREAS/CFO WI | Board, Officer | 40 | $432,146 |
| Molling DO Paul E | DIRECTOR/VICE CHAIR | Board, Officer | 40 | $417,933 |
| Foss MD Randy M | DIRECTOR/CHAIR/PRESIDENT | Board, Officer | 40 | $416,059 |
| Paul Travis C | DIR/SECY/TREAS/REG CHAIR-ADMIN SWMN | Board, Officer | 1 | $413,481 |
| Skaar MD Phillip J | DIRECTOR/CHAIR | Board, Officer | 40 | $400,253 |
| Slama DO Timothy B | DIRECTOR/VICE CHAIR | Board, Officer | 40 | $398,406 |
| Crockett Eric D | DIR/ASST SECY/REGIONAL CHAIR-ADMIN SEMN | Board, Officer | 1 | $397,241 |
| Galindez Jr Peter | ASST SECY/FORMER OFFICER | Officer | 40 | $394,754 |
| Holst Tanner T | DIRECTOR/REGIONAL CHAIR-ADMIN SWWI | Board, Officer | 40 | $363,254 |
| Avikainen Bridget F | DIRECTOR/CHAIR/PRESIDENT | Board, Officer | 1 | $348,551 |
| Janssen James J | ASST TREASURER | Officer | 40 | $309,721 |
| Smith Chuck J | ASST TREASURER | Officer | 40 | $300,931 |
| Flattum Bethanie L | TREAS/VICE CHAIR - ADMIN | Officer, Key employee | 40 | $290,884 |
| Eberle Michele R | DIR/VP/SECY/VICE CHAIR-ADMIN | Board, Officer | 40 | $289,212 |
| Drucker Paul E | DIRECTOR/CEO/PRESIDENT | Board, Officer | 1 | $271,661 |
| Rustad Christopher D | DIR/SECY/TREAS/FORMER OFFICER | Board, Officer | 1 | $269,881 |
| Kuehl MD Mary J | DIRECTOR/VICE CHAIR | Board, Officer | 40 | $242,469 |
| Gulden Christopher R | SECY | Officer | 40 | $222,577 |
| Boyum Lisa L | TREASURER | Officer | 40 | $219,839 |
| Bikkani Abhi | ASST SECY | Officer | 40 | $200,535 |
| Brown William A | ASST TREASURER | Officer | 40 | $196,490 |
| Fennell Thomas J | ASST SECY | Officer | 40 | $192,054 |
| Krumm Tara L | DIRECTOR/SECY/TREAS | Board, Officer | 40 | $180,337 |
| Bartelt Jennifer M | DIRECTOR/SECRETARY | Board, Officer | 1 | $178,666 |
| Dalbello Jr Albert | DIRECTOR/SECRETARY | Board, Officer | 40 | $144,533 |
| Becker John | DIRECTOR/TREAS/CHAIR | Board, Officer | 1 | None reported |
| Bergeron-Bowe Melissa | DIRECTOR/SECRETARY | Board, Officer | 1 | None reported |
| Johnson Holly | DIRECTOR/VICE PRESIDENT | Board, Officer | 1 | None reported |
| Olson Benjamin D | DIRECTOR/TREASURER | Board, Officer | 1 | None reported |
| Werner Mary Jo | DIRECTOR/SECY | Board, Officer | 1 | None reported |
| Wilson Melissa | DIRECTOR/SECY | Board, Officer | 1 | None reported |
| Young DDS Richard B | DIRECTOR/PRESIDENT | Board, Officer | 1 | None reported |
| Ross Christopher J | CHIEF INFORMATION OFFICER | Key employee | 40 | $1,618,664 |
| Willman MD Cheryl L | DIR/EXEC DIR CANCER PROGRAMS | Board, Key employee | 40 | $1,570,027 |
| Halamka MD John D | PRESIDENT-MAYO CLINIC PLATFORM | Key employee | 40 | $1,523,136 |
| Wiechmann MD Robert J | MCHS CLINICAL PRACTICE VICE CHAIR WI | Key employee | 40 | $1,394,377 |
| Gilligan Sherri W | CHIEF MARKETING OFFICER | Key employee | 40 | $1,129,648 |
| Bolan MD Candice W | CHAIR-DEPT OF RADIOLOGY | Key employee | 40 | $920,609 |
| Frederick Ryannon K | CHIEF NURSING OFFICER | Key employee | 40 | $899,970 |
| Reddy Mbbs Kunam S | DIV CHR-TRANSPLANT SURGERY | Key employee | 40 | $878,319 |
| Rosenfeld MD David M | CHAIR-ANSETH & PERIOP MED | Key employee | 40 | $789,236 |
| Petrou MD Steven P | PHYSICIAN | Key employee | 40 | $748,682 |
| Etzioni MD David A | CHAIR-DEPT OF SURGERY | Key employee | 40 | $733,151 |
| Craig MD Fiona E | CHAIR-LAB MED & PATH | Key employee | 40 | $732,089 |
| Zargham Brian O | CHIEF STRATEGY OFFICER | Key employee | 40 | $714,944 |
| Poe John D | DIR/CHAIR-EDU ADMIN | Board, Key employee | 40 | $707,211 |
| Abel MD Martin D | CHAIR-ANESTH & PERIOP MED | Key employee | 40 | $703,463 |
| Jones MD Jeremy C | PHYSICIAN | Key employee | 40 | $702,479 |
| Krosch MD Tara C | MCHS CLINICAL PRACTICE VICE CHAIR MN | Key employee | 40 | $696,968 |
| Goyal Maneesh | COO-MAYO CLINIC PLATFORM | Key employee | 40 | $695,181 |
| Singbartl MD Kai | PHYSICIAN-CRITICAL CARE | Key employee | 40 | $691,681 |
| Bartlett MD Brian N | MCHS CLINICAL PRACTICE VICE CHAIR MN | Key employee | 40 | $689,513 |
| Gazelka MD Halena M | CHIEF COMMUNICATIONS OFFICER | Key employee | 40 | $686,693 |
| Schams MD Peter J | PHYSICIAN | Key employee | 40 | $658,755 |
| Varela MD Nicole L | PHYSICIAN | Key employee | 40 | $651,230 |
| Samkutty Biju T | COO INTERNATIONAL | Key employee | 40 | $622,023 |
| Olmstead DO Matthew J | MCHS CLINICAL PRACTICE VICE CHAIR WI | Key employee | 40 | $613,112 |
| Urumov MD Andrej | CHAIR-DEPT OF EMERGENCY MED | Key employee | 40 | $578,539 |
| Krien MD Joseph S | PHYSICIAN | Key employee | 40 | $565,659 |
| Horvath MD Paul R | PHYSICIAN | Key employee | 40 | $508,237 |
| Nordstrom MD Charles W | MCHS CLINICAL PRACTICE CHAIR WI | Key employee | 40 | $498,377 |
| Young MD Timothy J | MCHS CLINICAL PRACTICE VICE CHAIR WI | Key employee | 40 | $473,145 |
| Liwonjo MD Anne | MCHS CLINICAL PRACTICE VICE CHAIR SEMN | Key employee | 40 | $452,757 |
| Lenhart MD Jill | MCHS CHAIR FAMILY MEDICINE | Key employee | 40 | $433,489 |
| Misra MD Artika | MCHS CLINICAL PRACTICE VICE CHAIR MN | Key employee | 40 | $406,766 |
| Tappy Dawn | CHIEF COMMUNICATIONS OFFICER | Key employee | 40 | $377,817 |
| Ammash MD Naser M | CEO-SSMC | Key employee | 40 | $359,872 |
| Faller MD Annette | PHYSICIAN | Key employee | 40 | $335,426 |
| Degen Susanne C | DIR/VICE CHAIR-ADMIN | Board, Key employee | 40 | $320,048 |
| Eide Dean B | DIR/VICE CHAIR-ADMIN | Board, Key employee | 40 | $305,924 |
| Caplan Sherry M | VICE CHAIR-ADMINISTRATION | Key employee | 40 | $305,416 |
| Lanz April D | VICE CHAIR-ADMINISTRATION | Key employee | 40 | $291,605 |
| Tradewell Matthew W | VICE CHAIR - ADMINISTRATION | Key employee | 40 | $289,704 |
| Martin-Krajewski Carie A | VICE CHAIR-ADMINISTRATION | Key employee | 40 | $280,886 |
| Archer Lisa M | CHIEF NURSING OFFICER MCHS | Key employee | 40 | $280,420 |
| Keilman Dena R | CHIEF NURSING OFFICER-MCHS | Key employee | 40 | $269,443 |
| Buchholtz Kelly M | CHIEF NURSING OFFICER | Key employee | 40 | $253,914 |
| Quinones-Hinojosa MD Alfredo | DIRECTOR | Board | 40 | $1,719,577 |
| Meyer MD Fredric B | DIR/EXEC DEAN OF EDU | Board | 40 | $1,509,983 |
| Shah MD Vijay | DIRECTOR | Board | 1 | $1,276,696 |
| Cross III MD William W | DIRECTOR | Board | 1 | $992,162 |
| Abdel MD Matthew P | DIRECTOR | Board | 1 | $982,968 |
| Mabry MD Tad M | DIRECTOR | Board | 1 | $982,166 |
| Hoxworth MD Joseph M | DIRECTOR | Board | 40 | $969,965 |
| Faubion MD William A | DIRECTOR | Board | 40 | $956,443 |
| Vallow MD Laura A | DIRECTOR | Board | 40 | $921,946 |
| Kendrick MD Michael L | DIRECTOR | Board | 1 | $919,064 |
| Cooper MD Leslie T | DIRECTOR | Board | 40 | $904,428 |
| Taner MD Burcin C | DIRECTOR | Board | 40 | $880,771 |
| Hara MD Amy K | DIRECTOR | Board | 40 | $873,061 |
| Bruce MD Charles J | DIRECTOR | Board | 40 | $870,849 |
| Leibovich MD Bradley C | DIRECTOR | Board | 1 | $868,324 |
| Fonseca MD Rafael | DIRECTOR | Board | 40 | $861,367 |
| Thiel MD David D | DIRECTOR | Board | 40 | $834,129 |
| Raffals MD Laura E | DIRECTOR | Board | 1 | $817,053 |
| Hsi MD Eric D | DIRECTOR | Board | 1 | $811,361 |
| Brown MD Michael J | DIRECTOR | Board | 1 | $768,722 |
| Humphreys MD Mitchell R | DIRECTOR | Board | 40 | $766,355 |
| Dronca MD Roxana S | DIRECTOR | Board | 40 | $760,442 |
| Lal MD Devyani | DIRECTOR | Board | 40 | $719,537 |
| Osuebi MD Okechukwu N | DIRECTOR | Board | 40 | $705,356 |
| Nassar MD Aziza | DIRECTOR | Board | 40 | $703,260 |
| Watson MD James C | DIRECTOR | Board | 1 | $698,791 |
| Janus MD Jeffrey R | DIRECTOR | Board | 40 | $689,375 |
| Famuyide Mbbs Abimbola O | DIRECTOR | Board | 1 | $675,685 |
| Colletti MD James E | DIRECTOR | Board | 1 | $667,549 |
| Zurob MD Adel S | DIRECTOR | Board | 40 | $636,936 |
| Hickson MD Latonya J | DIRECTOR | Board | 40 | $631,090 |
| Johnson MD Margaret M | DIRECTOR | Board | 40 | $615,844 |
| Porter MD Alyx B | DIRECTOR | Board | 40 | $614,527 |
| Luke MD Anuradha | DIRECTOR | Board | 1 | $570,510 |
| Fisher DO Laura A | DIRECTOR | Board | 40 | $553,088 |
| Faubion MD Stephanie S | DIRECTOR | Board | 40 | $548,361 |
| Meschia MD James F | DIRECTOR | Board | 40 | $541,753 |
| Brien MD Amy L | DIRECTOR | Board | 40 | $537,818 |
| Costakos MD Dennis T | DIRECTOR | Board | 40 | $536,783 |
| Caviness MD John N | DIRECTOR | Board | 40 | $476,979 |
| Langbehn DO Jennifer M | DIRECTOR | Board | 40 | $473,338 |
| Odenigbo MD Celestine | DIRECTOR | Board | 40 | $473,293 |
| Robelia MD Paul M | DIRECTOR | Board | 1 | $470,946 |
| Maniaci MD Michael J | DIRECTOR | Board | 40 | $465,064 |
| Buechler MD Tamara E | DIRECTOR | Board | 1 | $456,489 |
| Wray-Raabolle MD Jason T | DIRECTOR | Board | 40 | $452,450 |
| Myhre MD Karen K | DIRECTOR | Board | 40 | $439,149 |
| Bhagra MD Sumit | DIRECTOR | Board | 40 | $430,652 |
| Herrmann MD Martin J | DIRECTOR | Board | 40 | $428,428 |
| Petch Connie S | DIRECTOR | Board | 40 | $422,769 |
| Pruthi MD Sandhya | DIRECTOR | Board | 1 | $416,995 |
| Rimsza MD Lisa M | DIRECTOR | Board | 40 | $415,416 |
| Bauer MD Brent A | DIRECTOR | Board | 1 | $396,159 |
| Wariboko MD Brian I | DIRECTOR | Board | 40 | $391,809 |
| Forster MD Jeremy S | DIRECTOR | Board | 40 | $367,944 |
| Wolf Sherry L | DIRECTOR | Board | 40 | $346,116 |
| Lebrasseur Nathan K | DIRECTOR | Board | 1 | $332,730 |
| Lehman Lindsey M | DIRECTOR | Board | 1 | $329,847 |
| Gross Tera L | DIRECTOR | Board | 40 | $322,988 |
| McConnell Lisa A | DIRECTOR | Board | 40 | $287,103 |
| Murphy Marialena | DIRECTOR | Board | 40 | $286,102 |
| Long Amy K | DIRECTOR | Board | 40 | $260,316 |
| Abildgaard Scott S | DIRECTOR | Board | 40 | $196,606 |
| Nowicki Jessica H | DIRECTOR | Board | 40 | $175,669 |
| Edwards MD Brooks S | DIRECTOR | Board | 1 | $59,872 |
| Apolo Austere | DIRECTOR | Board | 1 | None reported |
| Arntz Susan | DIRECTOR | Board | 1 | None reported |
| Bents Ian | DIRECTOR | Board | 1 | None reported |
| Beyer Jessica | DIRECTOR | Board | 1 | None reported |
| Binsfeld Matt | DIRECTOR | Board | 1 | None reported |
| Borsheim Paul | DIRECTOR | Board | 1 | None reported |
| Bosse Patty | DIRECTOR | Board | 1 | None reported |
| Branstad Pat | DIRECTOR | Board | 1 | None reported |
| Christensen Sister Georgia | DIRECTOR | Board | 1 | None reported |
| Clark Diane | DIRECTOR | Board | 1 | None reported |
| Durand Kathie | DIRECTOR | Board | 1 | None reported |
| Grove Michael | DIRECTOR | Board | 1 | None reported |
| Halom Martin | DIRECTOR | Board | 1 | None reported |
| Hansen Mark | DIRECTOR | Board | 1 | None reported |
| Heil Steven | DIRECTOR | Board | 1 | None reported |
| Kasper John | DIRECTOR | Board | 1 | None reported |
| Kunsman Justin | DIRECTOR | Board | 1 | None reported |
| Legare Greg | DIRECTOR | Board | 1 | None reported |
| Martin Doug | DIRECTOR | Board | 1 | None reported |
| Mathy Scott | DIRECTOR | Board | 1 | None reported |
| McGrath Cindy | DIRECTOR | Board | 1 | None reported |
| McGraw Colleen | DIRECTOR | Board | 1 | None reported |
| Milow Josh | DIRECTOR | Board | 1 | None reported |
| Mommsen Hugh | DIRECTOR | Board | 1 | None reported |
| Nibaur Mark | DIRECTOR | Board | 1 | None reported |
| Notermann Amy | DIRECTOR | Board | 1 | None reported |
| Oliver Tracy | DIRECTOR | Board | 1 | None reported |
| Perry Michael | DIRECTOR | Board | 1 | None reported |
| Riebe Daniel | DIRECTOR | Board | 1 | None reported |
| Sanchez Daisey | DIRECTOR | Board | 1 | None reported |
| Schmidt James | DIRECTOR | Board | 1 | None reported |
| Schoenbauer Brad | DIRECTOR | Board | 1 | None reported |
| Sevcik Chera | DIRECTOR | Board | 1 | None reported |
| Smith Joshua | DIRECTOR | Board | 1 | None reported |
| Traetow Judy | DIRECTOR | Board | 1 | None reported |
| Walter Dale | DIRECTOR | Board | 1 | None reported |
| Walter Kevin | DIRECTOR | Board | 1 | None reported |
| Zelaya Nidia | DIRECTOR | Board | 1 | None reported |
| Zwiefelhofer Kelsey A | DIRECTOR | Board | 1 | None reported |
Top 10 paid people listed
These 10 people received $25,070,648, which is 0.5% of the $4,947,465,507 salary base shared by 65,470 employees.
| Name | Title | Role | Hours/week | From this org | From related orgs | Other pay | Total |
|---|---|---|---|---|---|---|---|
| Farrugia MD Gianrico | DIRECTOR/CEO/PRESIDENT | Board, Officer, Key employee | 40 | $4,822,235 | $0 | $65,861 | $4,888,096 |
| Thielen MD Kent R | DIRECTOR/CHAIR/CEO FL | Board, Officer, Key employee | 40 | $3,113,840 | $0 | $92,959 | $3,206,799 |
| Gray MD Richard J | DIR/CHAIR/CEO AZ/FORMER KEY | Board, Officer, Key employee | 40 | $3,110,824 | $0 | $91,199 | $3,202,023 |
| Williams MD Amy W | DIR/VICE CHAIR/EXEC DEAN OF PRACTICE | Board, Officer, Key employee | 40 | $2,299,102 | $0 | $29,667 | $2,328,769 |
| Zorn Christina K | DIR/CAO/FORMER OFFICER | Board, Officer, Key employee | 40 | $2,087,648 | $0 | $81,916 | $2,169,564 |
| Dahlen Dennis E | DIRECTOR/VP/FORMER OFFICER | Board, Officer | 40 | $1,888,039 | $0 | $102,215 | $1,990,254 |
| Pham MD Si M | PHYSICIAN | Highly paid employee | 40 | $1,935,509 | $0 | $42,552 | $1,978,061 |
| Murphy Joshua B | SECRETARY/ASST SECY | Officer | 40 | $1,785,340 | $0 | $53,341 | $1,838,681 |
| Gorman Paul A | TREASURER | Officer | 40 | $1,655,287 | $0 | $93,537 | $1,748,824 |
| Quinones-Hinojosa MD Alfredo | DIRECTOR | Board | 40 | $1,634,549 | $0 | $85,028 | $1,719,577 |
Sources
- IRS e-file return 202523189349303887 (Form 990, period ending 2024-12-31): readable copy at ProPublica Nonprofit Explorer
- IRS Tax Exempt Organization Search for EIN 38-3952644
- Organization website (as filed): www.mayoclinic.org