Testing backreaction effects with observational Hubble parameter data Shu-Lei Cao, Huan-Yu Teng, Hao-Yi Wan, Hao-Ran Yu and Tong-Jie Zhang Eur. Phys. J. C, 78 2 (2018) 170 Published online: 26 February 2018 DOI: 10.1140/epjc/s10052-018-5616-4