Prevalence of menstrual pain and symptoms and their association with age and BMI among Japanese female app users. - Liu, Shuxian; Yoneoka, Daisuke; Suzuki, Hitomi; Sasayama, Kiriko; Saito, Eiko; Naraoka, Yuna; Hosokawa, Momo; Igarashi, Ataru; Ota, Erika (Scientific Reports, 2025)