TY  - BOOK
AU  - Eldridge, Sandra
AU  - Kerry, Sally
TI  - A practical guide to cluster randomised trials in health services research
SN  - 9780470510476
U1  - 610.730721 ELD 
PY  - 2012///
CY  - Chichester
PB  - John Wiley
KW  - Research
N1  - Research; Randomised trials; Sample size; Research design; research ethics
ER  -