Offshoring index, moving up index and teardrop baseline offshoring index of the femoral head for diagnosis of adult acetabular dysplasia: study protocol for a self-controlled, diagnostic trial and preliminary results  
Qin Di, Hu Shi-wei, Li Hui-jie, He Li-ying, Wu Xiao-bo, Wu Tao, Ma Wen-hui, Han Yong-tai
Chinese Journal of Tissue Engineering Research . 2018, (19): 3039 -3043 .  DOI: 10.3969/j.issn.2095-4344.0284