Level IV, diagnostic study. See Guidelines for Authors for a complete description of levels of evidence.
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.
This record was last updated on 07/04/2016 and may not reflect the most current and accurate biomedical/scientific data available from NLM.
The corresponding record at NLM can be accessed at https://www.ncbi.nlm.nih.gov/pubmed/19760471