At the present time, how many H per D are you exposed to the smoke of others:Time:Pt:^Patient:Qn:PhenX
at the present time, how many h per d are you exposed to the smoke of others:time:pt:^patient:qn:phenx
At the present time, how many hours per day are you exposed to the smoke of others [PhenX]
at the present time, how many hours per day are you exposed to the smoke of others [phenx]