1 The Dartmouth Institute for Health Policy and Clinical Practice, Geisel School of Medicine at Dartmouth, Hanover, NH 03755, USA.
2 Departments of Community and Family Medicine and Obstetrics and Gynecology, Geisel School of Medicine at Dartmouth and Dartmouth-Hitchcock Medical Center, Lebanon, NH 03766, USA.
3 Jönköping Academy for the Improvement of Health and Welfare, Jönköping University, Jönköping, Sweden.