title: 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".
authors.forename: René T
authors.initials: RT
authors.lastname: Proyer
authors.forename: Willibald
authors.initials: W
authors.lastname: Ruch
authors.forename: Frank A
authors.initials: FA
authors.lastname: Rodden
mesh_terms: D000368:Aged; D003866:Depressive Disorder / Q000628:therapy*; D005081:Exercise Therapy / Q000379:methods*; D005260:Female; D006801:Humans; D027641:Laughter Therapy / Q000379:methods*; D011615:Psychotherapy, Group / Q000379:methods*; D016032:Randomized Controlled Trials as Topic; D015013:Yoga / Q000523:psychology*