Chen, S., Xu, B., Liu, N., Jiang, H., Zhang, X., Yang, Y., Liu, J., Sha, G., Zhu, W., & Chen, M. (2015). Improved effectiveness and safety of flexible ureteroscopy for renal calculi (<2 cm): A retrospective study. Canadian Urological Association Journal, 9(5-6), E273–7. https://doi.org/10.5489/cuaj.2649