One-year survey of methadone-induced cardiac complications. 

Taheri SK, Bawand R, Sanginabadi F, Khansari N, Moradi A. 

Caspian J Intern Med. 2023 Winter;14(1):43-46. doi: 10.22088/cjim.14.1.43. PMID: 36741481; PMCID: PMC9878909.

https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9878909/