Hachul H, Andersen ML, Bittencourt L, Santos-Silva R, Tufik S
A population-based survey on the influence of the menstrual cycle and the use of hormonal contraceptives on sleep patterns in São Paulo, Brazil
Int J Gynaecol Obstet120(2):137-40.120(2):137-40.doi: 10.1016/j.ijgo.2012.08.020

