Ma, H.-Z., Zeng, B.-F., Li, X.-L., & Chai, Y.-M. (2008). Temporal and spatial expression of BMP-2 in sub-chondral bone of necrotic femoral heads in rabbits by use of extracorporeal shock waves. Acta Orthopaedica, 79(1), 98–105. https://doi.org/10.1080/17453670710014833