Is your 'double-blind' design truly double-blind?
Oxtoby
A
A
Whiston Hospital, Prescot, Merseyside.
Jones
A
A
Robinson
M
M
D002986:Clinical Trials as Topic / Q000592:standards*; D004311:Double-Blind Method; D006801:Humans; D010506:Periodicals as Topic / Q000592:standards; D012107:Research Design / Q000592:standards