1 Division of Healthcare of Women and Children, School of Nursing, Duke University, 307 Trent Drive, Durham, NC 27710, USA; Department of Urology, Duke University Hospital, 40 Duke Medicine Cir Clinic 1G, Durham, NC 27710, USA.
2 Department of Medical Informatics and Clinical Epidemiology, Oregon Health and Science University, 3181 SW Sam Jackson Park Rd, Portland, OR 97239, USA.
3 Department of Biological Sciences, University of Alabama in Huntsville, 301 Sparkman Dr, Huntsville, AL 35899, USA.
4 Department of Medical Informatics and Clinical Epidemiology, Oregon Health and Science University, 3181 SW Sam Jackson Park Rd, Portland, OR 97239, USA; Department of Obstetrics and Gynecology, Oregon Health and Science University, 3181 SW Sam Jackson Park Rd, Portland, OR 97239, USA. Electronic address: karstens@ohsu.edu.