Letter on Shahidi et al. (2011): "Laughter Yoga versus group exercise program in elderly depressed women: a randomized controlled trial" I -- first things first! Caveats in research on "laughter yoga".

Letter on Shahidi et al. (2011): "Laughter Yoga versus group exercise program in elderly depressed women: a randomized controlled trial" I -- first things first! Caveats in research on "laughter yoga".