Resources
Bibliography
http://medicaldevices.asmedigitalcollection.asme.org/article.aspx?articleid=1473945
http://archpedi.jamanetwork.com/article.aspx?articleid=189060
http://www.sciencedaily.com/releases/2009/06/090630075614.htm
http://alltennisplayer.blogspot.com/2013/01/novak-djokovic-profile-and-pics.html (web page)
https://www.youtube.com/watch?v=QALJjCkW_ZI (web page)