Prevalence and Self-Perceived Experiences With the Use of Hormonal Contraceptives Among Competitive Female Cross-Country Skiers and Biathletes in Norway: The FENDURA Project. - Engseth TP; Andersson EP; Solli GS; Morseth B; Thomassen TO; Noordhof DA; Sandbakk Ø; Welde B (Frontiers in sports and active living, 2022)