1. Bureau UC . Parks, recreation, and travel: Participation in sports activity statistics: 1998, table no. 435. 1998. Available online at
http://www.allcountries.org/uscensus/435_participation_in_selected_sports_activities.html
. (accessed March 2016).
2. PADI. Professional Association of Diving Instructors course catalogue. Available online at
http://www.padi.com/scuba-diving/padi-courses/course-catalogue/
(accessed March 2016).
3. Goldstein G R, Katz W . Divers mouth syndrome. N Y State Dent J 1982; 48: 523–525.
4. Hirose T, Ono T, Maeda Y . Influence of wearing a scuba diving mouthpiece on the stomatognathic system- considerations for mouthpiece design. Dent Traumatol 2015; 32: 219–224.
5. Yousef M K, Ibrahim M, Assiri A, Hakeem A . The prevalence of oro-facial barotrauma among scuba divers. Diving Hyperb Med 2015; 45: 181–183.