Effect of computerized physician order entry and a team intervention on prevention of serious medication errors - Bates, DW; Leape, LL; Cullen, DJ; Laird, N; Petersen, LA; Teich, JM; Burdick, E; Hickey, M; Kleefield, S; Shea, B; Vander Vliet, M; Seger, DL (JAMA, 1998)