Study protocol to explore the social effects of environmental exposure and lifestyle behaviours on pregnancy outcome: an overview of cohort of pregnant women study oleh Valentin Simoncic, Virginie Hamann, Loriane Huber, Phillipe Deruelle, Nicolas Sananes, Christophe Enaux, Maxime Alter, Charles Schillinger, Severine Deguen, Wahida Kihal-Talantikite