Correction: Microbial diversity in two traditional bacterial douchi from Gansu province in northwest China using Illumina sequencing

• Weibing Zhang, 
• Qiaoqiao Luo, 
• Yan Zhu, 
• Jiang Ma, 
• Lei Cao, 
• Min Yang, 
• Pencheng Wen, 
• Zhongmin Zhang, 
• Xiaoling He