Characterization of the Safety and Pharmacokinetic Profile of D-Methadone, a Novel N-Methyl-D-Aspartate Receptor Antagonist in Healthy, Opioid-Naive Subjects: Results of Two Phase 1 Studies - Bernstein, Galina; Davis, Kelly; Mills, Catherine; Wang, Lu; McDonnell, Michael; Oldenhof, John; Inturrisi, Charles; Manfredi, Paolo L; Vitolo, Ottavio V (Journal of clinical psychopharmacology, 2019)