15. Subjects who, through completion of this study, would have donated more than 500 ml of blood in 7 days, or 750 ml of blood in 30 days, 1000 ml in 90 days, 1250 ml in 120 days, 1500 ml in 180 days, 2000 ml in 270 days, 2500 ml of blood in 1 year.