title: Spontaneous pregnancy and unexplained infertility: a gift with many whys.
authors.affiliation: Department of Biomedical Sciences and Advanced Therapies, Section of Obstetrics and Gynecology, University of Ferrara, Ferrara, Italy. E-mail: roberto.marci@unife.it.
authors.forename: Ilaria
authors.initials: I
authors.lastname: Soave
authors.forename: Giuseppe
authors.initials: G
authors.lastname: Lo Monte
authors.forename: Roberto
authors.initials: R
authors.lastname: Marci