Cesarean section and increased body mass index in school children: two cohort studies from distinct socioeconomic background areas in Brazil - Goldani, Marcelo Zubaran; Barbieri, Marco Antonio; Silva, Antonio Augusto Moura da; Gutierrez, Manoel Romeu Pereira; Bettiol, Heloisa; Goldani, Helena Ayako Sueno (Nutrition Journal, 2013)