TI - SElected abstracts PT - JOUR DP - 1979 TA - JAMA pages = {99-04}, VI - 242 IP - 1 AID - 10.1001/jama.1979.03300010073044 [doi] 4100 - http://dx.doi.org/10.1001/jama.1979.03300010073044 SO - JAMA July 6, 1979 242(1):99