@article{articlef1162e71,
title   = {Validation and internal consistency of Patient Health Questionnaire-9 for major depression in Parkinson's disease},
author = {Chagas, Marcos Hortes Nisihara and Tumas, Virot and Rodrigues, Guilherme R. and Machado-de-Sousa, João Paulo and Santos Filho, Alaor and Hallak, Jaime Eduardo Cecílio and Crippa, José Alexandre de Souza},
year = {2013},
doi = {10.1093/ageing/aft065},
journal   = {Age and Ageing}
}