Methadone Pharmacokinetics in Geriatric Critically Ill Patients Following Intramuscular and Intravenous Administration: A Pilot Study - Beik Rassouli, Safoura; Rouini, Mohammad Reza; Najmeddin, Farhad; Gheimati, Azin; Golabchifar, Ali A; Tabib, Kimia; Ahmadi, Arezoo; Sadeghi, Kourosh; Honarmand, Hooshyar; Hadi, Ali Mohammed; Mojtahedzadeh, Mojtaba (Journal of Pharmaceutical Care, 2020)