Erratum to: SorGSD: a sorghum genome SNP database. Issue 1 (December 2016) - Luo, Hong; Zhao, Wenming; Wang, Yanqing; Xia, Yan; Wu, Xiaoyuan; Zhang, Limin; Tang, Bixia; Zhu, Junwei; Fang, Lu; Du, Zhenglin; Bekele, Wubishet; Tai, Shuaishuai; et al.