AUTHOR=Chegini Valiollah Goudarzvand , Kazemifar Amir Mohammad , Tavakolian Amir Ershad , Karimi Arian Ghannadi , Sofi Arsalan Jamali Pour , Ipchian Darya , Kamali Sahand , Varkiani Mehran Ebrahimi , Yazdi Zohreh TITLE=Evaluating the effect of chronic and continuous use of methadone on the glomerular filtration rate of patients receiving oral methadone (syrup) JOURNAL=Frontiers in Medicine VOLUME=11 YEAR=2024 URL=https://www.frontiersin.org/journals/medicine/articles/10.3389/fmed.2024.1496505 DOI=10.3389/fmed.2024.1496505 ISSN=2296-858X