A clerical error led to the online posting of the names and Social Security numbers of 492 people who spoke at Ohio University's Centers for Osteopathic Research and Education, a spokeswoman said.
On July 16, the centers, known as CORE, removed a spreadsheet that contained the information. It had been accessible since March 20 and was discovered when a nurse found the information last week while conducting online research.
A document that should have been posted did not contain personal information, according to CORE.
There is no indication that any of the personal information was misused, said CORE spokeswoman Karoline Lane.
"We're just very sorry that this happened," she said.
The person responsible for posting the information was put on paid administrative leave and has no access to the Web site or to CORE data pending a review, Lane said.
In addition to names and Social Security numbers, the spreadsheet included contact numbers, addresses, their speaking topics and federal employer identification numbers.
CORE, based in Pickerington, has sent information to the people affected, posted an informational Web site and set up a toll-free number for questions. CORE also is offering credit-monitoring service for one year.
CORE is an osteopathic medical education consortium. Speakers, many of them doctors and nurses, talk to residents as part of their training, Lane said.
Those affected by the incident can go to www.ohiocore.org/answers or call 1-866-437-8698.