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

. 2013 Aug 10;6(4):337–347. doi: 10.1159/000354746

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

Copyright © 2013 by S. Karger GmbH, Freiburg

This is an Open Access article licensed under the terms of the Creative Commons Attribution-NonCommercial 3.0 Unported license (CC BY-NC) (www.karger.com/OA-license), applicable to the online version of the article only. Distribution permitted for non-commercial purposes only.

PMC Copyright notice

Fig. 1 — Flow chart of participants.