作者单位:Univ N Carolina, Sch Med, Dept Family Med, Prevent Med Residency Program, CB 7595, Chapel Hill, NC[1]Univ N Carolina, Sch Med, Dept Phys Med & Rehabil, Program Integrat Med, CB 7200, Chapel Hill, NC[2]CUNY, Sch Educ, Lehman Coll, Bronx, NY 10468 USA[3]Univ N Carolina, Dept Family Med, Lineberger Comprehens Canc Ctr, Chapel Hill, NC 27599 USA[4]