[1] Univ Utah, Sch Med, Dept Family & Prevent Med, Salt Lake City, UT 84112 USA
[2] Univ Iowa, Dept Obstet & Gynecol, Carver Coll Med, 31332 PFP,200 Hawkins Dr, Iowa City, IA 52242 USA
[3] Iowa City VA Hlth Care Syst, Ctr Comprehens Access & Delivery Res & Evaluat CA, Iowa City, IA USA
[4] Vet Rural Hlth Resource Ctr, VA Off Rural Hlth ORH, Iowa City, IA USA
[5] Univ Iowa, Dept Internal Med, Carver Coll Med Iowa City, Iowa City, IA 52242 USA
[6] Cent Arkansas Vet Healthcare Syst, Ctr Mental Healthcare Outcomes & Res, Little Rock, AK USA
[7] Univ Arkansas Med Sci, Dept Psychiat, Little Rock, AK USA
[8] Univ Iowa, Dept Epidemiol, Coll Publ Hlth, Iowa City, IA USA
[9] Univ Iowa, Dept Neurosurg & Surg, Carver Coll Med, Iowa City, IA USA
[10] Univ Iowa, Dept Psychiat, Carver Coll Med, Iowa City, IA 52242 USA