[1] Univ Iowa, Dept Obstet & Gynecol, Carver Coll Med, 200 Hawkins Dr, Iowa City, IA 52242 USA
[2] Univ Iowa, Dept Internal Med, Carver Coll Med, Iowa City, IA 52242 USA
[3] Iowa City Vet Affairs Hlth Care Syst, Ctr Comprehens Access & Delivery Res & Evaluat CA, Iowa City, IA USA
[4] Iowa City Vet Affairs Hlth Care Syst, VA Off Rural Hlth ORH, Vet Rural Hlth Resource Ctr, Iowa City, IA USA
[5] Univ Iowa, Dept Epidemiol, Coll Publ Hlth, Iowa City, IA USA
[6] Univ Iowa, Dept Psychiat, Carver Coll Med, Iowa City, IA 52242 USA