- Correspondence to Dr Babette M Pluim, Department of Sports Medicine, Royal Netherlands Lawn Tennis Association, KNLTB, Displayweg 4, 3821 BT Amersfoort, The Netherlands;
- Received July 13, 2012
- Revised January 4, 2013
- Accepted January 7, 2013
- First published January 30, 2013.
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