共 8 条
[1]
External hip protectors
[J].
JOURNAL OF THE AMERICAN GERIATRICS SOCIETY,
1997, 45 (09)
:1158-1158
[3]
Cluster randomised trials: time for improvement - The implications of adopting a cluster design are still largely being ignored
[J].
BMJ-BRITISH MEDICAL JOURNAL,
1998, 317 (7167)
:1171-1172
[7]
PARKER MJ, 2001, COCHRANE LIB
[8]
Contamination in trials: is cluster randomisation the answer?
[J].
BMJ-BRITISH MEDICAL JOURNAL,
2001, 322 (7282)
:355-357