Ovulatory status and menstrual cycle duration assessed by self-collection of urine on pH strips in a population-based sample of French women not using hormonal contraception. Rosetta, L.; Thalabard, J. C.; Tanniou, J.; Ducot, B.; Maitrot-Mantelet, L.; Rousset-Jablonski, C.; Bohet, A.; Bouyer, J.; Chimenes, A.; Slama, R.. Eur J Contracept Reprod Health Care. 2017; 22: p.450-458. doi:10.1080/13625187.2017.1410881Article