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Noriyuki Ebi, Shoji Tokunaga, Kazunobu Itoh, Isamu Okamoto, Nobutaka Edakuni, Shinji Fujii, Kentaro Watanabe, Shinichiro Hayashi, Takashige Maeyama, Yoichi Nakanishi 
World J Respirol 6(1):42-48. Published online Mar 28, 2016. doi: 10.5320/wjr.v6.i1.42