Polysomnographic Characteristics of Snoring Children: A Familial Study of Obstructive Sleep Apnea Syndrome Daniel Morell-Garcia; José Antonio Peña-Zarza; Pilar Sanchís; Javier Piérola; Mónica de la Peña; Josep Miquel Bauça; Nuria Toledo-Pons; Paloma Giménez; Caterina Ribot; Alberto Alonso-Fernández; Antonia Barceló;