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Construct validation of patient global impression of severity (PGI-S) and improvement (PGI-I) questionnaires in the treatment of men with lower urinary tract symptoms secondary to benign prostatic hyperplasia

Lars Viktrup*, Risa P Hayes, Ping Wang and Wei Shen

BMC Urology 2012, 12:30  doi:10.1186/1471-2490-12-30

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