Walder DJ, Statucka M, Daly MP, Axen K, Haber M. Biological sex and menstrual cycle phase modulation of cortisol levels and psychiatric symptoms in a non-clinical sample of young adults. Psychiatry Res. 2012 May 30;197(3):314–21. doi: 10.1016/j.psychres.2011.09.009. PMID: 22364929.