This work was supported by grants from the National Natural Science Foundation of China(Nos.81770875 and 81572639);the Science and Technology Department of Sichuan Province(No.2018SZ0142);Sichuan University(No.2018SCUH0093);the National Clinical Research Center for Geriatrics of West China Hospital(No.Z2018B05).
To the Editor:We reported a 46-year-old man presented with progressive pain in his left lower extremities for more than 5 years.Physical examination showed short stature,"O"-type bending in his lower extremities,and"p...