Is hysterosalpingo-foam sonography (HyFoSy) more tolerable in terms of pain and anxiety than hysterosalpingography (HSG)? A prospective real-world setting multicentre study. - Serrano González L; Pérez-Medina T; Bueno Olalla B; Royuela A; De La Cuesta MLR; Saéz de la Mata D; Domínguez-Franjo E; Calles-Sastre L; Engels V (BMC women's health, 2022)