Comparative primate obstetrics: Observations of 15 diurnal births in wild gelada monkeys (Theropithecus gelada) and their implications for understanding human and nonhuman primate birth evolution. - Nguyen N; Lee LM; Fashing PJ; Nurmi NO; Stewart KM; Turner TJ; Barry TS; Callingham KR; Goodale CB; Kellogg BS; Burke RJ; Bechtold EK; et al. (American journal of physical anthropology, 2017)