FEMaLe: The use of machine learning for early diagnosis of endometriosis based on patient self-reported data—Study protocol of a multicenter trial by Balogh, DB, Hudelist, G, Bļizņuks, D, Raghothama, J, Becker, CM, Horace, R, Krentel, H, Horne, AW, Bourdel, N, Marki, G, Tomassetti, C, Kirk, UB, Acs, N, Bokor, A