1. Muscle Research Centre, Department of Medicine, University Clinical Departments, Liverpool University, c/o The Duncan Building, Daulby Street, Liverpool L69 3GA, U.K.
2. School of Health and Sport Science, University of North London, London N7 8DB, U.K.
3. Department of Health, Staffordshire University, Stafford ST4 2DF, U.K.
4. Department of Physical Education and Sport Science, Limerick University, Limerick, Ireland
5. Department of Paediatrics, Birmingham Heartlands Hospital, Birmingham B9 5SS, U.K.
6. Institute of Sports Medicine and Exercise Science, Sheffield University, Sheffield S10 2TA, U.K.