Kurland BF, Gill TM, Patrick DL, Larson EB, Phelan EA. Longitudinal change in positive affect in community-dwelling older persons. J Am Geriatr Soc. 2006 Dec;54(12):1846-53.
Kurland BF, Gill TM, Patrick DL, Larson EB, Phelan EA. Longitudinal change in positive affect in community-dwelling older persons. J Am Geriatr Soc. 2006 Dec;54(12):1846-53.