Bouhassira D, Perrot S, Attal N, Ramirez-Gil JF, et al. Combination of inhaled nitrous oxide and oral opioids induces long-lasting
analgesic effects in patients with neuropathic pain: ProtoTOP study post hoc
exploratory analyses. Pain 2021 Dec 20. pii: 00006396-900000000-97811.
PMID: 35050957