How many H per W have you been exposed:Time:Pt:^Patient:Qn:PhenX
how many h per w have you been exposed:time:pt:^patient:qn:phenx
How many H per W have you been exposed:Time:To identify measures at a point in time:^Patient:Quantitative:PhenX
how many h per w have you been exposed:time:to identify measures at a point in time:^patient:quantitative:phenx