M. Cheyney, Bovbjerg, M. L., Everson, C., Gordon, W., Hannibal, D., and Vedam, S.,
“Development and validation of a national data registry for midwife-led births: the Midwives Alliance of North America Statistics Project 2.0 dataset.”,
J Midwifery Womens Health, vol. 59, no. 1, pp. 8-16, 2014.