PORTLAND, Ore.—Oregon Health Authority (OHA) and Clackamas County officials have identified another measles exposure location and are recommending people who believe they were exposed to talk to a health care provider about their risks.  People might have been exposed if they were at the following location at this date and time:  Providence Willamette Falls Medical Center, emergency department waiting room, 1500 Division St., Oregon City, between 9:57 p.m. Wednesday, Feb. 25, and 12:22 a.m. Thursday, Feb. 26.  People who were at this location during these dates and time period should immediately contact a health care provider and let them know they may have been exposed to someone who has measles. The health care provider can determine whether you are immune to measles based on your vaccination record, age, or laboratory evidence of prior infection.