About how often do your severe headaches occur:NRat:Pt:^Patient:Qn:PhenX
about how often do your severe headaches occur:nrat:pt:^patient:qn:phenx
About how often do your severe headaches occur:NRat:Pt:^Patient:Qn:PhenX
about how often do your severe headaches occur:nrat:pt:^patient:qn:phenx