Reply to the Letter to the Editor Shahidi M, Mojtahed A, Modabbernia A., et al. 2011. Laughter yoga versus group exercise program in elderly depressed women: a randomized controlled trial. Int J Geriatr Psychiatr 26: 322–327. First things first! Caveats in research on “laughter yoga”

Authors

• Amirhossein Modabbernia,

  1. Psychiatric Research Center, Roozbeh Psychiatric Hospital, Tehran University of Medical Sciences, Tehran, Iran

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• Mahvash Shahidi,

  1. Department of Counseling, School of Psychology and Teaching Sciences, Allameh Tabatabai University, Tehran, Iran

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• Mohammad Mojtahed,

  1. Deputy of Research, Imam Khomeini Hospital, Tehran University of Medical Sciences, Tehran, Iran

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• Ali Mojtahed

  1. Deputy of Research, Imam Khomeini Hospital, Tehran University of Medical Sciences, Tehran, Iran

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