Oguma A, Shimizu K, Kimura H, Tanabe N, Sato S, Yokota I, Takimoto-Sato M, Matsumoto-Sasaki M, Abe Y, Takei N, Goudarzi H, Suzuki M, Makita H, Hirai T, Nishimura M, Konno S; Hi-CARAT investigators. Differential role of mucus plugs in asthma: Effects of smoking and association with airway inflammation. Allergol Int. [Epub ahead of print]