Unilateral axilo-breast approach (UABA) with gas insufflation versus open conventional hemithyroidectomy: A prospective comparative study David Saavedra-Pérez; Marti Manyalich; Paula Domínguez; Jordi Farguell; Ramón Rull; Miguel Ángel López-Boado; Jaime Vilaça; Óscar Vidal;