Guidelines for the management of spontaneous preterm labor: identification of spontaneous preterm labor, diagnosis of preterm premature rupture of membranes, and preventive tools for preterm birth - Di Renzo, Gian Carlo; Roura, Lluis Cabero; Facchinetti, Fabio; Antsaklis, Aris; Breborowicz, Gregor; Gratacos, Eduard; Husslein, Peter; Lamont, Ronnie; Mikhailov, Anton; Montenegro, Nuno; Radunovic, Nebojsa; Robson, Mike; et al. (The journal of maternal-fetal & neonatal medicine, 2011)