Menstrual health interventions, schooling, and mental health problems among Ugandan students (MENISCUS): study protocol for a school-based cluster-randomised trial oleh Catherine Kansiime, Laura Hytti, Kate Andrews Nelson, Belen Torondel, Suzanna C. Francis, Clare Tanton, Giulia Greco, Sophie Belfield, Shamirah Nakalema, Fred Matovu, Andrew Sentoogo Ssemata, Connie Alezuyo, Stella Neema, John Jerrim, Chris Bonell, Janet Seeley, Helen A. Weiss, MENISCUS Group