http://europepmc.org/abstract/MED/25846456
http://europepmc.org/abstract/MED/11244334
http://europepmc.org/abstract/MED/7981076
http://europepmc.org/abstract/MED/12322838
http://europepmc.org/abstract/MED/15221786
http://europepmc.org/abstract/MED/7547235
http://europepmc.org/abstract/MED/23791828
http://europepmc.org/abstract/MED/11595686
http://europepmc.org/abstract/MED/16183105
http://europepmc.org/abstract/MED/28125452
http://europepmc.org/abstract/MED/1333465
http://europepmc.org/abstract/MED/16459017
http://europepmc.org/abstract/MED/28734796
http://europepmc.org/abstract/MED/7852189
http://europepmc.org/abstract/MED/12648581
http://europepmc.org/abstract/MED/8481915
http://europepmc.org/abstract/MED/15099937
http://europepmc.org/abstract/MED/21726664