Ritonavir:Susc:Pt:Isolate:Ord:Genotyping
ritonavir:susc:pt:isolate:ord:genotyping
Ritonavir:Susceptibility:To identify measures at a point in time:Isolate:Ordinal:Genotyping
ritonavir:susceptibility:to identify measures at a point in time:isolate:ordinal:genotyping