TY  - BOOK
AU  - Schulz, Kenneth F
AU  - Grimes, David A
TI  - Essential concepts in clinical research : randomised controlled trials and observational epidemiology
SN  - 9780702073946
PY  - 2018///
CY  - St Louis
PB  - Elsevier
KW  - Research
KW  - Research Methods
ER  -