Offerhaus, P. M., Geerts, C., de Jonge, A., Hukkelhoven, C. W., Twisk, J. W., & Lagro-Janssen, A. L. (2015). Variation in referrals to secondary obstetrician-led care among primary midwifery care practices in the Netherlands: A nationwide cohort study. BMC Pregnancy Childbirth.

Offerhaus, Pien M., Caroline Geerts, Ank de Jonge, Chantal WPM Hukkelhoven, Jos WR Twisk, et Antoine LM Lagro-Janssen. "Variation in Referrals to Secondary Obstetrician-led Care Among Primary Midwifery Care Practices in the Netherlands: A Nationwide Cohort Study." BMC Pregnancy Childbirth 2015.

Offerhaus, Pien M., et al. "Variation in Referrals to Secondary Obstetrician-led Care Among Primary Midwifery Care Practices in the Netherlands: A Nationwide Cohort Study." BMC Pregnancy Childbirth 2015.