Collaborative stepped care for anxiety disorders in primary care: aims and design of a randomized controlled trial by Spinhoven Philip, van Marwijk Harm WJ, Feltz-Cornelis Christina, Muntingh Anna DT, Assendelft Willem JJ, de Waal Margot WM, Hakkaart-van Roijen Leona, Adèr Herman J, van Balkom Anton JLM

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