TI - GRanddaddy and boys he knew in school PT - JOUR DP - 1999 TA - JAMA pages = {402D}, VI - 281 IP - 5 AID - 10.1001/jama.281.5.402 [doi] 4100 - http://dx.doi.org/10.1001/jama.281.5.402 SO - JAMA February 3, 1999 281(5):402D