K. Aagaard et al., “The Placenta Harbors a Unique Microbiome,” Science Translational Medicine 6, no. 237 (May 21, 2014): 237ra65.
32
Romero et al., “Composition and Stability of Vaginal Microbiota of Normal Pregnant Women Different from That of Non-Pregnant Women.”
33
Michelle K. Osterman and Joyce A. Martin, “Changes in Cesarean Delivery Rates by Gestational Age: United States, 1996–2011,” NCHS Data Brief, no. 124, June 2013: 1–8; Luz Gibbons et al., The Global Numbers and Costs of Additionally Needed and Unnecessary Cesarean Sections Performed per Year: Overuse as a Barrier to Universal Coverage. Geneva, Switzerland: World Health Organization, 2010.
