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M. E. Falagas; K. Z. Vardakas; P. I. Vergidis. (2007). Under-diagnosis of common chronic diseases: prevalence and impact on human health. , 61(9), 1569–1579. doi:10.1111/j.1742-1241.2007.01423.x 
10.1111/j.1742-1241.2007.01423.x