1. Tobacco Research Institute, Chinese Academy of Agricultural Sciences, No.4 Keyuanjing, Laoshan District, Qingdao , Shandong 266101, China
2. Nanjing Agricultural University, No.1 Weigang, Xuanwu District, Nanjing , Jiangsu 210095, China
3. Haikou Cigar Research Institute, Hainan Provincial Branch of China National Tobacco Corporation, No.120 Hongchenghu Road, Qiongshan District, Haikou , Hainan 571103, China
4. Qiannan Branch of Guizhou Tobacco Corporation, No.8 Hebin, Duyun , Guizhou 558000, China
5. Rizhao Branch of Shandong Tobacco Corporation, No.269 Juzhou, Donggang District, Rizhao , Shandong 276800, China