AU - Campion FD TI - WIndows PT - JOUR DP - 1989 TA - JAMA pages = {556}, VI - 262 IP - 4 AID - 10.1001/jama.1989.03430040128042 [doi] 4100 - http://dx.doi.org/10.1001/jama.1989.03430040128042 SO - JAMA July 28, 1989 262(4):556