Environmental maternal exposures and the risk of premature birth and intrauterine growth restriction: The Generation Gemelli study protocol of newborn exposome - Leonardo Villani; Angelo Maria Pezzullo; Roberta Pastorino; Alessandra Maio; Francesca Stollagli; Chiara Tirone; Marta Barba; Angela Maria Cozzolino; Denise Pires Marafon; Martina Porcelli; Annamaria Sbordone; Maria Letizia Patti; et al. (PLoS ONE)