Fig. 3From: A comparison of metrics and performance characteristics of different search strategies for article retrieval for a systematic review of the global epidemiology of kidney and urinary diseasesNumber of published articles by search strategy and year of publication. a Number of records initially retrieved by search (step 2); b Number of records classified as potentially useful (step 3); c Number of useful full-text articles with data extracted (step 7). Only completely covered by the search strategies years are shownBack to article page