Treatment Resistant Depression Market, By Drug Type (Antidepressants, Selective Serotonin Reuptake Inhibitors, Serotonin-norepinephrine Reuptake Inhibitors, Others, Atypical agents, Others), By Distribution Channel (Hospital Pharmacies, Retail Pharmacies, and Online Pharmacies), By Geography (North America, Latin America, Asia Pacific, Europe, Middle East, and Africa)