Design and methodological considerations in the National Cooperative Gallstone Study: A multicenter clinical trial
Titel:
Design and methodological considerations in the National Cooperative Gallstone Study: A multicenter clinical trial
Auteur:
Lachin, John M. Marks, Jay W. Schoenfield, Leslie J. NCGS Protocol Committee, Tyor, Malcolm P. Bennett, Peter H. Grundy, Scott M. Hardison, William G.M. Shaw, Lawrence W. Thistle, Johnson L. Vlahcevic, Z.R. National Cooperative Gallstone Study Group,