References
- Eng , JJ and Pierrynowski , MR . 1993 . Phys Ther , 73 ( 2 ) : 62 – 8 .
- Collins , N . 2008 . BMJ , 337 : 735
- Hermens , HJ . 2000 . J Electromyogr Kinesiol , 10 ( 5 ) : 361 – 74 .
- Van Tiggelen , D . 2009 . Am J Sports Med , 37 ( 6 ) : 1099 – 105 .