title: Response: The timing of monozygotic twinning: a pro-life challenge to conventional scientific wisdom.
authors.affiliation: University of Navarra, Spain. Electronic address: gherranz@unav.es.
authors.forename: G
authors.initials: G
authors.lastname: Herranz
mesh_terms: D020554:Sperm Injections, Intracytoplasmic; D038522:Twinning, Monozygotic; D014430:Twins, Monozygotic