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Spek, V., Nyklícek, I., Smits, N., Cuijpers, P., Riper, H., Keyzer, J. and Pop, V. (2007) Internet-based cognitive behavioural therapy for subthreshold depression in people over 50 years old: A randomized controlled clinical trial. Psychological Medicine, 37, 1797-1806.
doi:10.1017/S0033291707000542
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