title: [Epidemiology].
authors.affiliation: Maternité Port-Royal, université Paris-Descartes, hôpital Cochin-Saint-Vincent-de-Paul, AP-HP, 123, boulevard de Port-Royal, 75014 Paris, France. francois.goffinet@cch.aphp.fr
authors.forename: F
authors.initials: F
authors.lastname: Goffinet