International Archives of Otorhinolaryngology, 24 Mar 2015 https://www.thieme-connect.com/products/ejournals/html/10.1055/s-0034-1372510
International Archives of Otorhinolaryngology, 07 Feb 2015 https://www.thieme-connect.com/products/ejournals/html/10.1055/s-0034-1372510