"29. The benefits, risks, burdens and effectiveness of a new method should be tested against those of the best current prophylactic, diagnostic, and therapeutic

"29. The benefits, risks, burdens and effectiveness of a new method should be tested against those of the best current prophylactic, diagnostic, and therapeutic methods. This does not exclude the use of placebo, or no treatment, in studies where no proven prophylactic, diagnostic or therapeutic method exists." https://en.wikipedia.org/wiki/Placebo-controlled_study#Declaration_of_Helsinki https://en.wikipedia.org/wiki/Placebo-controlled_study#Decla...