Number of specimens obtained:Num:Stdy:Gastrointestinal tract.upper:Qn:EGD
number of specimens obtained:num:stdy:gastrointestinal tract.upper:qn:egd
Number of specimens obtained:Number:Duration of the study:Gastrointestinal tract.upper:Quantitative:EGD
number of specimens obtained:number:duration of the study:gastrointestinal tract.upper:quantitative:egd