http://europepmc.org/abstract/MED/18084252
http://europepmc.org/abstract/MED/24633194
http://europepmc.org/abstract/MED/11385321
http://europepmc.org/abstract/MED/27159395
http://europepmc.org/abstract/MED/12015762
http://europepmc.org/abstract/MED/22653804
http://europepmc.org/abstract/MED/10671680
http://europepmc.org/abstract/MED/11957146
http://europepmc.org/abstract/MED/11161379
http://europepmc.org/abstract/MED/29876005
http://europepmc.org/abstract/MED/11329142
http://europepmc.org/abstract/MED/21470976
http://europepmc.org/abstract/MED/12708483
http://europepmc.org/abstract/MED/11048799
http://europepmc.org/abstract/MED/16021566
http://europepmc.org/abstract/MED/10416591
http://europepmc.org/abstract/MED/28103826
http://europepmc.org/abstract/MED/18552176
http://europepmc.org/abstract/MED/19085831
http://europepmc.org/abstract/MED/10076565
http://europepmc.org/abstract/MED/25624430
http://europepmc.org/abstract/MED/22635024
http://europepmc.org/abstract/MED/28481359
http://europepmc.org/abstract/MED/18500270
http://europepmc.org/abstract/MED/9721853
http://europepmc.org/abstract/MED/12439748
http://europepmc.org/abstract/MED/21726664