Comment on

• Assessment of the Contrast-Enhanced Ultrasound in Percutaneous Nephrolithotomy for the Treatment of Patients with Nondilated Collecting System.

  Guo X, Zhang Z, Liu Z, Fu H, Gao X, Yang H, Gao P, Li X, Ai W, He Z, Du D. Guo X, et al. J Endourol. 2021 Apr;35(4):436-443. doi: 10.1089/end.2020.0564. Epub 2020 Oct 30. J Endourol. 2021. PMID: 32935565 Clinical Trial.
• Diet and Kidney Stones: The Ideal Questionnaire.

  Penniston KL. Penniston KL. Eur Urol Focus. 2021 Jan;7(1):9-12. doi: 10.1016/j.euf.2020.09.001. Epub 2020 Sep 19. Eur Urol Focus. 2021. PMID: 32958415
• Lower Socioeconomic Status is Associated With Adverse Urinary Markers and Surgical Complexity in Kidney Stone Patients.

  Quarrier S, Li S, Penniston KL, Best SL, Hedican SP, Jhagroo RA, Nakada SY. Quarrier S, et al. Urology. 2020 Dec;146:67-71. doi: 10.1016/j.urology.2020.09.025. Epub 2020 Sep 28. Urology. 2020. PMID: 32991913
• Effect of alanine supplementation on oxalate synthesis.

  Wood KD, Freeman BL, Killian ME, Lai WS, Assimos D, Knight J, Fargue S. Wood KD, et al. Biochim Biophys Acta Mol Basis Dis. 2021 Jan 1;1867(1):165981. doi: 10.1016/j.bbadis.2020.165981. Epub 2020 Sep 28. Biochim Biophys Acta Mol Basis Dis. 2021. PMID: 33002578 Free PMC article.