[Study on relationship between osteoporosis and mRNA expressions of vascular endothelial growth factor and bone morphogenetic protein 2 in nontraumatic avascular necrosis of femoral head].
Wang
Weijun
W
Department of Orthopaedics, No.7 People's Hospital of Zibo, Zibo Shandong, 255040, PR China. wwjwjx118@sina.com
Li
Sisheng
S
Niu
Dongsheng
D