PhenX - tobacco - age of initiation of use - adolescent protocol 030701:-:Pt:^Patient:-:PhenX
phenx - tobacco - age of initiation of use - adolescent protocol 030701:-:pt:^patient:-:phenx
PhenX - tobacco - age of initiation of use - adolescent protocol 030701:-:To identify measures at a point in time:^Patient:-:PhenX
phenx - tobacco - age of initiation of use - adolescent protocol 030701:-:to identify measures at a point in time:^patient:-:phenx