Erratum to: A randomized prospective controlled trial comparing the laryngeal tube suction disposable and the supreme laryngeal mask airway: the influence of head and neck position on oropharyngeal seal pressure. Issue 1 (December 2016) - Somri, Mostafa; Vaida, Sonia; Garcia Fornari, Gustavo; Mendoza, Gabriela; Charco-Mora, Pedro; Hawash, Naser; Matter, Ibrahim; Swaid, Forat; Gaitini, Luis