1. Research Institute of the McGill University Health Centre; Montreal Canada
2. McGill Research Centre for Physical Activity & Health; McGill University; Montreal Canada
3. Present address: Department of Kinanthropologie; Universite du Quebec a Montreal; Montreal Canada
4. Division of Geriatric Medicine; McGill University; Montreal Canada
5. Lady Davis Institute for Medical Research; Jewish General Hospital; Montreal Canada
6. Department of Kinesiology & Physical Education; McGill University; Montreal Canada
7. Neurotune; Zurich Switzerland
8. Department of Mathematics and Statistics; McGill University; Montreal Canada