http://europepmc.org/abstract/MED/10737795
http://europepmc.org/abstract/MED/21901162
http://europepmc.org/abstract/MED/24943349
http://europepmc.org/abstract/MED/22810696
http://europepmc.org/abstract/MED/27756406
http://europepmc.org/abstract/MED/26650777
http://europepmc.org/abstract/MED/23856246
http://europepmc.org/abstract/MED/29844865
http://europepmc.org/abstract/MED/25957691
http://europepmc.org/abstract/MED/9589476
http://europepmc.org/abstract/MED/25617745
http://europepmc.org/abstract/MED/10074927
http://europepmc.org/abstract/MED/22895193
http://europepmc.org/abstract/MED/25344691
http://europepmc.org/abstract/MED/24755471
http://europepmc.org/abstract/MED/28481359
http://europepmc.org/abstract/MED/29420467
http://europepmc.org/abstract/MED/28978093
http://europepmc.org/abstract/MED/26071483
http://europepmc.org/abstract/MED/9419979
http://europepmc.org/abstract/MED/21837511
http://europepmc.org/abstract/MED/9482574