1 Correction to: J. Fixed Point Theory Appl. (2018) 20:74 https://doi.org/10.1007/s11784-018-0554-1

In the original article the affiliation of the corresponding author Pham Ngoc Anh was wrongly published. The correct affiliation is “Pham Ngoc Anh, Faculty of Mathematics and Statistics, Ton Duc Thang University, Ho Chi Minh city, Vietnam”.