Malliou, P., S. Rokka, G. Tsiganos, S. Mavromoustakos, and G. Godolias. “Dance Aerobic instructors’ Injuries in Relation to External Risk Factors, Part II”. Journal of Human Sport and Exercise, vol. 8, no. 3, Dec. 2013, pp. 813-9, doi:10.4100/jhse.2013.83.06.