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The current Declaration of Helsinki (compare footnote #7) declares that new interventions should be tested against the best proven intervention, and that placebo or no intervention should be used only for compelling and scientifically sound methodological reasons, with extreme care against abuse.[9] Yet smoking cessation researchers continue sacrificing participants to controls that promise the widest possible margin of victory, the biggest headlines, and the fattest profits

Allegra et al

Another consideration is to check with the country you are travelling to

It weakens the whole structure of your skeleton

Retailers could not carry every brand and ever sub-brand, so chose the most popular of each one