Atmospheric conditions, lunar phases, and childbirth: a multivariate analysis - Ochiai, Angela Megumi; Gonçalves, Fábio Luiz Teixeira; Ambrizzi, Tércio; Silva, Lucia Cristina Florentino Pereira da; Wei, Chang Yi; Soares, Alda Valéria Neves; Araújo, Natalúcia Matos; Gualda, Dulce Maria Rosa (International Journal of Biometeorology, 2011)