H.- feng Yuan, J. Zhang, C.- an Guo, and Z.- qin Yan, “ Clinical outcomes of osteonecrosis of the femoral head after autologous bone marrow stem cell implantation: a meta-analysis of seven case-control studies ”, Clinics, vol. 71, no. 2, pp. 110–113, Feb. 2016, doi: 10.6061/clinics/2016(02)10.