Figure - PMC

Skip to main content

An official website of the United States government

Here's how you know

Here's how you know

Official websites use .gov
A .gov website belongs to an official government organization in the United States.

Secure .gov websites use HTTPS
A lock ( ) or https:// means you've safely connected to the .gov website. Share sensitive information only on official, secure websites.

View full-text article in PMC

. 2016 Oct 31;5(4):219–236. doi: 10.7762/cnr.2016.5.4.219

Search in PMC
Search in PubMed
View in NLM Catalog
Add to search

Copyright © 2016 The Korean Society of Clinical Nutrition

This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/3.0/) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.

PMC Copyright notice

Flowchart of the article-selection process.

Search strategy and number of trials identified for inclusion in the literature review. The searches were performed between November 2001 and May 2015. The search strategy evolved in line with the changes in information technology and was designed with advice from information specialists. The databases searched in the study included Medical Literature Analysis and Retrieval System Online (MEDLINE), and the Elsevier database of abstracts and citations (SCOPUS).