Twinning and Multiple Birth Rates According to Maternal Age in the City of São Paulo, Brazil: 2003–2014 - Otta, Emma; Fernandes, Eloisa de S.; Acquaviva, Tiziana G.; Lucci, Tania Kiehl; Kiehl, Leda de Castro; Varella, Marco Antonio Correa; Segal, Nancy L.; Valentova, Jaroslava Varella (Twin Research and Human Genetics, 2016)