Flag for 2nd course treatment start date not populated:Prid:Pt:Subsequent cancer Rx:Nom
flag for 2nd course treatment start date not populated:prid:pt:subsequent cancer rx:nom
Flag for 2nd course treatment start date not populated:Presence or Identity:To identify measures at a point in time:Subsequent cancer Rx:Nominal
flag for 2nd course treatment start date not populated:presence or identity:to identify measures at a point in time:subsequent cancer rx:nominal