Hyponatremia among runners in the Boston Marathon - Almond, C S; Shin, A Y; Fortescue, E B; Mannix, R C; Wypij, D; Binstadt, B A; Duncan, C N; Olson, D P; Salerno, A E; Newburger, J W; Greenes, D S (N Engl J Med, 2005)