title: Intramuscular vs intravaginal natural progesterone in patients undergoing in vitro fertilization-embryo transfer cycles. A retrospective observational, case-control study.
authors.affiliation: Centro Natalità, Obstetrics and Gynecology Department, Vita-Salute San Raffaele University, Milan, Italy. papaleo.enrico@hsr.it
authors.forename: E
authors.initials: E
authors.lastname: Papaleo
authors.forename: L
authors.initials: L
authors.lastname: Quaranta
authors.forename: M
authors.initials: M
authors.lastname: Molgora