Exercise-induced hyponatremia in ultradistance triathletes is caused by inappropriate fluid retention - Speedy, D B; Rogers, I R; Noakes, T D; Wright, S; Thompson, J M; Campbell, R; Hellemans, I; Kimber, N E; Boswell, D R; Kuttner, J A; Safih, S (Clin J Sport Med, 2000)