WASHINGTON, Aug. 15 -- The Maine Primary Care Association (MPCA), Augusta, has issued a public comment letter to the U.S. Department of Health and Human Services (HHS) expressing serious concerns regarding proposed changes to the interpretation of what constitutes a "Federal Public Benefit." In its letter, the MPCA warns that designating the Health Center Program as a federal public benefit could have detrimental effects on vulnerable populations, including both U.S. citizens and immigrants who  more ST