Yuan, MD, PhD, C.-S., S. Sun, PhD, A. Attele, MD, C.-Z. Wang, PhD, R. Tong, BS, and R. J. Israel, MD. “Methylnaltrexone Potentiates Body Weight and Fat Reduction With Leptin”. Journal of Opioid Management, vol. 5, no. 6, Jan. 2018, pp. 373-8, doi:10.5055/jom.2009.0037.