A study claims to compare giving people same molar amounts of potassium chloride and potassium citrate... (They obviously didn't do that, because potassium citrate has 3 potassium atoms while chloride has 1, so (a) it would make no sense to do that (b) they would need to be exceedingly lucky to so happen to find a potassium dose ratio other than 1:1 that gives indistinguishable effects. They most like mean "moles of potassium" without saying that.)