A prospective study of platelets and plasma proteolytic systems during the early stages of Rocky Mountain spotted fever - Rao, AK; Schapira, M; Clements, ML; Niewiarowski, S; Budzynski, AZ; Schmaier, AH; Harpel, PC; Blackwelder, WC; Scherrer, JR; Sobel, E; Colman, RW (N Engl J Med, 1988)