How old were you the first time you got this exposure:Time:Pt:^Patient:Qn:NHL
how old were you the first time you got this exposure:time:pt:^patient:qn:nhl
How old were you the first time you got this exposure:Time:To identify measures at a point in time:^Patient:Quantitative:NHL
how old were you the first time you got this exposure:time:to identify measures at a point in time:^patient:quantitative:nhl