http://europepmc.org/abstract/MED/11033733 http://europepmc.org/abstract/MED/15988144 http://europepmc.org/abstract/MED/20417866 http://europepmc.org/abstract/MED/9885986 http://europepmc.org/abstract/MED/20430445 http://europepmc.org/abstract/MED/15642392 http://europepmc.org/abstract/MED/9619731 http://europepmc.org/abstract/MED/18224418 http://europepmc.org/abstract/MED/16393685 http://europepmc.org/abstract/MED/7514242 http://europepmc.org/abstract/MED/7522291 http://europepmc.org/abstract/MED/18665825 http://europepmc.org/abstract/MED/8402610 http://europepmc.org/abstract/MED/12760263 http://europepmc.org/abstract/MED/17883173 http://europepmc.org/abstract/MED/7507193 http://europepmc.org/abstract/MED/11753612 http://europepmc.org/abstract/MED/15571802 http://europepmc.org/abstract/MED/9250799 http://europepmc.org/abstract/MED/22811791 http://europepmc.org/abstract/MED/27352183 http://europepmc.org/abstract/MED/24402164 http://europepmc.org/abstract/MED/18206543 http://europepmc.org/abstract/MED/17415815 http://europepmc.org/abstract/MED/9180915 http://europepmc.org/abstract/MED/8148423 http://europepmc.org/abstract/MED/16254134 http://europepmc.org/abstract/MED/21738341 http://europepmc.org/abstract/MED/26802623 http://europepmc.org/abstract/MED/7828132 http://europepmc.org/abstract/MED/1391946 http://europepmc.org/abstract/MED/11331327 http://europepmc.org/abstract/MED/27139612 http://europepmc.org/abstract/MED/16956837 http://europepmc.org/abstract/MED/7630188 http://europepmc.org/abstract/MED/8353289 http://europepmc.org/abstract/MED/26299742 http://europepmc.org/abstract/MED/8499624