http://health.usnews.com/health-news/articles/2014/04/27/laughter-may-work-like-meditation-in-the-brain
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[1] http://health.usnews.com/health-news/articles/2014/04/27/laughter-may-work-like-meditation-in-the-brain
[2] http://www.healthday.com (2014)