Butarbutar, J., Tatang, Y., Hariyanto, H., Tehupeory, E., & Pontoh, L. A. (2013). Distance between parapatellar portal and intra-articular space for needle positioning in knee osteoarthritis. Medical Journal of Indonesia, 22(2), 83–7. https://doi.org/10.13181/mji.v22i2.533