Depressive Disorder, Major

• For additional information regarding investigative sites for this trial, contact 1-877-CTLILLY (1-877-285-4559, 1-317-615-4559) Mon - Fri 9 AM - 5 PM Eastern time (UTC/GMT - 5 hours, EST), or speak with your personal physician. — Newport Beach, California, United States
• For additional information regarding investigative sites for this trial, contact 1-877-CTLILLY (1-877-285-4559, 1-317-615-4559) Mon - Fri 9 AM - 5 PM Eastern time (UTC/GMT - 5 hours, EST), or speak with your personal physician. — Sherman Oaks, California, United States
• For additional information regarding investigative sites for this trial, contact 1-877-CTLILLY (1-877-285-4559, 1-317-615-4559) Mon - Fri 9 AM - 5 PM Eastern time (UTC/GMT - 5 hours, EST), or speak with your personal physician. — Baltimore, Maryland, United States
• For additional information regarding investigative sites for this trial, contact 1-877-CTLILLY (1-877-285-4559, 1-317-615-4559) Mon - Fri 9 AM - 5 PM Eastern time (UTC/GMT - 5 hours, EST), or speak with your personal physician. — Gaithersburg, Maryland, United States

• Helsinki, Finland
• Jyväskylä, Finland
• Kuopio, Finland
• Tampere, Finland

• Pfizer Investigational Site — Beverly Hills, California, United States
• Pfizer Investigational Site — Norwich, Connecticut, United States
• Pfizer Investigational Site — New York, United States
• Pfizer Investigational Site — Beachwood, Ohio, United States

• Psychiatric Hospital at Vanderbilt — Nashville, Tennessee, United States

• Pfizer Investigational Site — Norwich, Connecticut, United States
• Pfizer Investigational Site — Aventura, Florida, United States
• Pfizer Investigational Site — Jacksonville, Florida, United States
• Pfizer Investigational Site — Miami, Florida, United States

• Stanford University School of Medicine — Stanford, California, United States
• Depression Research Clinic, Psychiatry Department, Stanford School of Medicine — Stanford, California, United States

• RBWH — Brisbane, Queensland, Australia

• Pharmacology Research Institute — Los Alamitos, California, United States
• Pharmacology Research Institute — Newport Beach, California, United States
• Pharmacology Research Institute — Northridge, California, United States
• Pharmacology Research Institute — Riverside, California, United States

Not specified

• Rijeka, Croatia
• Split, Croatia
• Zagreb, Croatia
• Tallinn, Estonia