Corrigendum: Urinary Luteinizing Hormone Tests: Which Concentration Threshold Best Predicts Ovulation? - Rene Antonio Leiva; Thomas Paul Bouchard; Saman Hasan Abdullah; Saman Hasan Abdullah; Saman Hasan Abdullah; Saman Hasan Abdullah; René Ecochard; René Ecochard; René Ecochard; René Ecochard (Frontiers Media S.A., 2018)