In placebo-controlled studies, experts who rate the degree of patient improvement following treatment must be kept unaware of
a. the funding source of the study
b. which subjects were in the treatment group and which were in the control group
c. who the authors of the study were and whether they implemented the treatment exactly as originally described
d. whether enough subjects were recruited so that the study will have generalizable results
Answer: b. which subjects were in the treatment group and which were in the control group
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