oncology eastern group performance cooperative status ecog days registration prior 
eastern cooperative oncology group ecog performance status patients subject clinical 
score karnofsky performance eastern cooperative oncology group ecog status lansky 
ps eastern cooperative ecog oncology group performance status scale score 
karnofsky eastern cooperative performance oncology ecog group status kps lansky 
score eastern cooperative group oncology performance ecog status subjects patients 
expectancy life eastern cooperative ecog group oncology performance status months 
score eastern cooperative oncology group ecog performance equal ps subject 
eastern cooperative oncology group ecog scale participants enrollment current eligible 
performance scale eastern cooperative ecog oncology group status karnofsky ps 
swog southwest oncology group performance status southwestern karnofsky zubrod eastern 
zubrod eastern oncology cooperative ecog group status performance level karnofsky 
age years lansky corresponding scores ecog patients eastern cooperative oncology 
eastern cooperative oncology ecog group performance status patient randomization grade