Li H-T, Luo S, Trasande L, Hellerstein S, Kang C, Li J-X et al. JAMA; 2017. Li H-T, Luo S, Trasande L, Hellerstein S, Kang C, Li J-X et al. Geographic Variations and Temporal Trends in Cesarean Delivery Rates in China, 2008-2014. JAMA. 2017; 317(1):69-76. doi: 10.1001/jama.2016.18663. 