Continuous overnight monitoring of body temperature during embryo transfer cycles as a proxy for establishing progesterone fluctuations by comparison with P4 blood progesterone results: a prospective, observational study - Knowles TG; García-Velasco JA; Toribio M; Garrido N; Barrio Pedraza AI; Colomé Rakosnik C; Salazar Vera A; Milnes R (Reproductive Biology And Endocrinology, 2025)