Differences in natural killer cell numbers between elite kayakers and non-athletes - Borges, G. F.; Rama, L.; Rosado, F.; Alves, F.; Sntos, A.; Gomes, B.; Massart, A.; Pedreiro, S.; Paiva, A.; Teixeira, A. M. (17th Annual Congress of the European College of Sport Science (ECSS), Bruges, 4. -7. July 2012, 2012)