**W**hich of these sound grammatically correct (please mark all the correct ones) and which one, if all were possible, is the best? Comparison of the effects of drug A with B on weights of patients with obesity Comparison of the effects of drug A with B on weight of patients with obesity Comparison of the effects of drug A and B on weights of patients with obesity Comparison of the effects of drug A and B on weight of patients with obesity Comparing drug A with B on weights of patients with obesity Comparing drug A with B on weight of patients with obesity Comparing drug A and B on weights of patients with obesity Comparing drug A and B on weight of patients with obesity Comparison of drug A and B on weight of patients with obesity Comparison of drug A and B on weights of patients with obesity Comparison of drug A with B on weight of patients with obesity Comparison of drug A with B on weights of patients with obesity

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