Reliability of morbidity data reported by GPs. Results of a longitudinal study in primary care by Zimmermann, T, Kaduszkiewicz, H, vd Bussche, H, Schön, G, Wegscheider, K, Werle, J, Weyerer, S, Wiese, B, Olbrich, J, Weeg, D, Riedel-Heller, S, Luppa, M, Jessen, F, Abholz, H H, Maier, W, Pentzek, M

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