Corrigendum to "Synthesis of Cr-doped SrTiO3 photocatalyst and its application in visible-light-driven transformation of CO2 into CH4" [Journal of CO2 Utilization 12 (2015) 43–48]. (March 2016) - Bi, Yiqing; Fahad Ehsan, Muhammad; Huang, Yan; Jin, Jiarui; He, Tao