1. http://www.orpha.net/consor/cgi‐bin/OC_Exp.php?lng=en&Expert=2451(last accessed December 2014).
2. http://www.bmj.com/specialties/otolaryngology‐ent
3. http://www.entnet.org/healthinformation/
4. http://www.niaid.nih.gov/topics/Pages/default.aspx
5. http://www.entnet.org/