Depressive Disorder, Major

• Gulhane Training and Research Hospital — Ankara, Turkey (Türkiye)

• Xiangya Second Hospital of Central South University — Changsha, Hunan, China

• VA Palo Alto Health Care System, Palo Alto, CA — Palo Alto, California, United States

• Psychiatry Unit, Via Santa Sofia 78 — Catania, Sicily, Italy
• Psychiatry Unit, Contrada Ferrante SNC — Enna, Sicily, Italy
• Cellular and Molecular Biology Laboratory, Tower of Biological Laboratories, 5th Floor Via Consolare Valeria 1 — Messina, Sicily, Italy
• Psychiatry Unit, Via Consolare Valeria 1 — Messina, Sicily, Italy

• entre for Psychedelics Research, Division of Psychiatry Imperial College London, Level 2, Commonwealth Building, Hammersmith Campus, Du Cane Road, London — London, United Kingdom

Not specified

• University of Turku — Turku, Finland

Not specified

• The Royal's Institute of Mental Health Research — Ottawa, Ontario, Canada

Not specified