Colletto, Gloria Maria Duccini Dal, Conceição Aparecida de Mattos Segre, and Bernardo Beiguelman. “Twinning Rate in a Sample from a Brazilian Hospital With a High Standard of Reproductive Care”. São Paulo Medical Journal 119, no. 6 (November 11, 2001): 216–219. Accessed October 16, 2025. https://periodicosapm.emnuvens.com.br/spmj/article/view/2785.