Appendix A1.

PHQ-9 PHQ-2 Questionnaire Chinese: Search Appendix

DATABASE	SEARCH STRATEGY
PubMed	(“PHQ-9” OR “PHQ-2” OR “patient health questionnaire-9” OR “patient health questionnaire-2” OR “Patient Health Questionnaire”[Mesh]) AND (“Depression/diagnosis”[Mesh] OR depression screening OR depression assessment OR “Depressive Disorder/diagnosis”[Mesh] OR depressive disorder screening OR depressive disorder assessment) AND (efficacy OR reliability OR validity OR utility OR “Validation Studies as Topic”[Mesh]) AND (Cantonese OR Mandarin OR Vietnamese OR Chinese OR China OR “China”[Mesh] OR Taiwan OR “Taiwan”[Mesh] OR Vietnam OR “Vietnam”[Mesh])
Web of Science	(“PHQ-9” OR “PHQ-2” OR “patient health questionnaire-9” OR “patient health questionnaire-2”) AND (“Depression diagnosis” OR depression screening OR depression assessment OR depressive disorder screening OR depressive disorder assessment) AND (efficacy OR reliability OR validity OR utility) AND (Cantonese OR Mandarin OR Vietnamese OR Chinese OR China OR Taiwan OR Vietnam)
Embase	(‘patient health questionnaire 2′/exp OR ‘patient health questionnaire 2′ OR ‘patient health questionnaire 9′/exp OR ‘patient health questionnaire 9′) AND (‘depression’/exp/dm_di OR ‘depression assessment’ OR ‘depression screening’) AND (‘efficacy parameters’/exp OR ‘efficacy parameters' OR ‘efficacy’/exp OR efficacy OR ‘validity’/exp OR validity OR ‘reliability’/exp OR reliability OR utility) AND (‘chinese’/exp OR chinese OR ‘cantonese language’/exp OR ‘cantonese language’ OR ‘cantonese’/exp OR cantonese OR ‘mandarin’/exp OR mandarin OR ‘mandarin language’/exp OR ‘mandarin language’ OR ‘vietnamese’/exp OR Vietnamese OR ‘china’/exp OR china OR ‘viet nam’/exp OR ‘viet nam’ OR ‘taiwan’/exp OR taiwan)
PsycINFO	(“PHQ-9” OR “PHQ-2” OR “patient health questionnaire-9” OR “patient health questionnaire-2”) AND (“Depression diagnosis” OR depression screening OR depression assessment OR depressive disorder screening OR depressive disorder assessment) AND (efficacy OR reliability OR validity OR utility) AND (Cantonese OR Mandarin OR Vietnamese OR Chinese OR China OR Taiwan OR Vietnam)