Patient compliance and satisfaction with a new forehead device for positional obstructive sleep apnoea treatment: a post hoc analysis of a randomised controlled trial oleh Carlos Egea, Sandra Ingles, Rafaela Vaca, Jose Cordero-Guevara, Jorge Ullate, Joaquin Durán-Cantolla, Jose L Manjón, Cecilia Tourino, Laura Hidalgo-Armas, Joaquín Durán-Carro, Jordi Rigau