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benefits of laughter therapy, the benefits of laughter, medical benefits of laughter, benefits of laughter on health, what are the health benefits of laughter, surprising benefits of laughter, studies on the benefits of laughter, benefits of laughter psychology, psychological benefits of laughter, which effects are benefits of laughter, physiological benefits of laughter, physical benefits of laughter, benefits of laughter physical health, laughter and its benefits, laughter and health benefits, how does laughter improve health, how does laughter benefit your health