http://europepmc.org/abstract/MED/11595686 http://europepmc.org/abstract/MED/16183105 http://europepmc.org/abstract/MED/1516069 http://europepmc.org/abstract/MED/22163003 http://europepmc.org/abstract/MED/8481915 http://europepmc.org/abstract/MED/27741368 http://europepmc.org/abstract/MED/15099937 http://europepmc.org/abstract/MED/23780408 http://europepmc.org/abstract/MED/11244334 http://europepmc.org/abstract/MED/15221786 http://europepmc.org/abstract/MED/23791828 http://europepmc.org/abstract/MED/15644779 http://europepmc.org/abstract/MED/21720365 http://europepmc.org/abstract/MED/7852189 http://europepmc.org/abstract/MED/12322838 http://europepmc.org/abstract/MED/8910623 http://europepmc.org/abstract/MED/23714252 http://europepmc.org/abstract/MED/25846551 http://europepmc.org/abstract/MED/16459017 http://europepmc.org/abstract/MED/7547235 http://europepmc.org/abstract/MED/28481359 http://europepmc.org/abstract/MED/22996961 http://europepmc.org/abstract/MED/9550561 http://europepmc.org/abstract/MED/27566247 http://europepmc.org/abstract/MED/28734796 http://europepmc.org/abstract/MED/7729734 http://europepmc.org/abstract/MED/8319218