TI - INdex to advertisers PT - JOUR DP - 1989 TA - JAMA pages = {594}, VI - 262 IP - 4 AID - 10.1001/jama.1989.03430040168059 [doi] 4100 - http://dx.doi.org/10.1001/jama.1989.03430040168059 SO - JAMA July 28, 1989 262(4):594