From the publication: > We conducted a phase IV, single-center, randomised, double-blind, placebo-controlled 4 x 4 crossover trial. I assume it means that the

From the publication: > We conducted a phase IV, single-center, randomised, double-blind, placebo-controlled 4 x 4 crossover trial. I assume it means that the control group gets placebo, so it's controlled for confidence boost.