Fig. 1From: Effect of low-dose ketamine on PerioperAtive depreSsive Symptoms in patients undergoing Intracranial tumOr resectioN (PASSION): study protocol for a randomized controlled trialFlow chart of psychiatric assessment and diagnosis process. PHQ-9 Patient Health Questionnaire-9, MADRS Montgomery-Ã…sberg Depression Rating Scale, PDS perioperative depressive symptomsBack to article page