TY - JOUR TI - Validation and internal consistency of Patient Health Questionnaire-9 for major depression in Parkinson's disease PY - 2013 AU - Chagas, Marcos Hortes Nisihara AU - Tumas, Virot AU - Rodrigues, Guilherme R. AU - Machado-de-Sousa, João Paulo AU - Santos Filho, Alaor AU - Hallak, Jaime Eduardo Cecílio AU - Crippa, José Alexandre de Souza T2 - Age and Ageing SN - 0002-0729 DO - 10.1093/ageing/aft065 UR - https://doi.org/10.1093/ageing/aft065 PP - Oxford VL - 42 IS - 5 SP - 645-649 ER -