TI - INdex to advertisers PT - JOUR DP - 1989 TA - JAMA pages = {722}, VI - 262 IP - 5 AID - 10.1001/jama.1989.03430050140053 [doi] 4100 - http://dx.doi.org/10.1001/jama.1989.03430050140053 SO - JAMA August 4, 1989 262(5):722