TI - INdex to advertisers PT - JOUR DP - 1989 TA - JAMA pages = {3562}, VI - 262 IP - 24 AID - 10.1001/jama.1989.03430240210052 [doi] 4100 - http://dx.doi.org/10.1001/jama.1989.03430240210052 SO - JAMA December 22, 1989 262(24):3562