Efficacy of Oxygen Treatment Using Home Oxygen Concentrators for the Treatment of Cluster Headaches: A Randomized, Crossover, Multicenter Study.

"Conflicts of Interest: Byung-Kun Kim and Min Kyung Chu, contributing editors of the Journal of Clinical Neurology, were not involved in the editorial evaluation or decision to publish this article.: Soo-Jin Cho has been the site investigator for a multicenter trial sponsored by Novartis, Allergan, Abbvie Pharma, Ildong Pharma, and Hyundai Pharma. She received honoraria as a speaker or moderator from Teva, Lilly Korea Ltd., Lundbeck, SK Chemical Pharm, Yuyu Pharma, Shinpoong Pharma, and Pfizer and the grant from JW Pharma. Byung-Kun Kim served on Lundbeck’s Advisory Board. He received honoraria as a moderator and speaker from Lundbeck, AbbVie, Pfizer, Eli Lilly, Teva, Yuyu Pharm, and SK Pharm. He has been the principal investigator of clinical trials sponsored by Eli-Lilly, Novartis, Lundbeck, Teva, AbbVie, and Ildong Pharm."

"Funding acquisition: Soohyun Cho, Soo-Jin Cho. Funding Statement: This research was supported by Hallym University Research Fund 2021 (HURF-2021-34)."