http://europepmc.org/abstract/MED/25148578 http://europepmc.org/abstract/MED/15737846 http://europepmc.org/abstract/MED/24265153 http://europepmc.org/abstract/MED/20544847 http://europepmc.org/abstract/MED/24336958 http://europepmc.org/abstract/MED/23340734 http://europepmc.org/abstract/MED/24918823 http://europepmc.org/abstract/MED/22048237 http://europepmc.org/abstract/MED/19996208 http://europepmc.org/abstract/MED/20551065 http://europepmc.org/abstract/MED/22817889 http://europepmc.org/abstract/MED/26822237 http://europepmc.org/abstract/MED/25363723 http://europepmc.org/abstract/MED/23673558 http://europepmc.org/abstract/MED/20571072 http://europepmc.org/abstract/MED/21295875 http://europepmc.org/abstract/MED/15467732 http://europepmc.org/abstract/MED/23890154 http://europepmc.org/abstract/MED/24866436 http://europepmc.org/abstract/MED/17308088 http://europepmc.org/abstract/MED/26524482 http://europepmc.org/abstract/MED/21725359 http://europepmc.org/abstract/MED/28481359 http://europepmc.org/abstract/MED/22475322 http://europepmc.org/abstract/MED/22536370 http://europepmc.org/abstract/MED/22406360 http://europepmc.org/abstract/MED/25886620 http://europepmc.org/abstract/MED/20689758