Van Cangh, P., Smith, A. D., NG, C. S., Ost, M. C., Marcovich, R., Wong, M., Joyce, A. D., Desai, R. A., & Assimos, D. G. (2007). Management of difficult kidney stones. Journal of Endourology, 21(5), 478-489. https://doi.org/10.1089/end.2007.9965 (Original work published 2007)