Is there an association between athletic amenorrhea and endothelial cell dysfunction? - Hoch, A. Z.; Dempsey, R. L.; Carrera, C. F.; Wilson, C. R.; Chen, E. H.; Barnabei, V. M.; Sandford, P. R.; Ryan, T. A.; Gutterman, D. D. (Medicine & Science in Sports & Exercise, 2003)