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Does the 12-item General Health Questionnaire contain multiple factors and do we need them?

Fei Gao email, Nan Luo email, Julian Thumboo email, Calvin Fones email, Shu-Chuen Li email and Yin-Bun Cheung email

Health and Quality of Life Outcomes 2004, 2:63doi:10.1186/1477-7525-2-63

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