共 50 条
- [34] SAMPLE-SIZE AND DURATION OF FOLLOW-UP FOR STRATIFIED CLINICAL-TRIALS CONTROLLED CLINICAL TRIALS, 1984, 5 (03): : 305 - 305
- [36] SURVEY METHODS IN CLINICAL-TRIALS - THE BIAS INTRODUCED BY INCOMPLETE FOLLOW-UP CONTROLLED CLINICAL TRIALS, 1985, 6 (03): : 232 - 232