TI - MIssing text, credit line PT - JOUR DP - 1989 TA - JAMA pages = {3412}, VI - 261 IP - 23 AID - 10.1001/jama.1989.03420230064026 [doi] 4100 - http://dx.doi.org/10.1001/jama.1989.03420230064026 SO - JAMA June 16, 1989 261(23):3412