Effects of a laughter program on body weight and mental health among Japanese people with metabolic syndrome risk factors: a randomized controlled trial by Narumi Funakubo, Eri Eguchi, Rie Hayashi, Mayumi Hirosaki, Kokoro Shirai, Kanako Okazaki, Hironori Nakano, Fumikazu Hayashi, Junichi Omata, Hironori Imano, Hiroyasu Iso, Tetsuya Ohira

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