TI - INdex to advertisers PT - JOUR DP - 1989 TA - JAMA pages = {1242}, VI - 261 IP - 8 AID - 10.1001/jama.1989.03420080166058 [doi] 4100 - http://dx.doi.org/10.1001/jama.1989.03420080166058 SO - JAMA February 24, 1989 261(8):1242