http://europepmc.org/abstract/MED/22650231
http://europepmc.org/abstract/MED/29615459
http://europepmc.org/abstract/MED/16402937
http://europepmc.org/abstract/MED/12727991
http://europepmc.org/abstract/MED/19487299
http://europepmc.org/abstract/MED/27528624
http://europepmc.org/abstract/MED/24862939
http://europepmc.org/abstract/MED/24834793
http://europepmc.org/abstract/MED/19913280
http://europepmc.org/abstract/MED/9861322
http://europepmc.org/abstract/MED/16931592
http://europepmc.org/abstract/MED/3293774
http://europepmc.org/abstract/MED/15320975
http://europepmc.org/abstract/MED/28975450
http://europepmc.org/abstract/MED/17426084
http://europepmc.org/abstract/MED/26971368
http://europepmc.org/abstract/MED/14508525
http://europepmc.org/abstract/MED/12788883
http://europepmc.org/abstract/MED/25487739
http://europepmc.org/abstract/MED/7704243
http://europepmc.org/abstract/MED/17651453
http://europepmc.org/abstract/MED/9414190
http://europepmc.org/abstract/MED/8761289
http://europepmc.org/abstract/MED/22675538
http://europepmc.org/abstract/MED/2021946
http://europepmc.org/abstract/MED/22961909
http://europepmc.org/abstract/MED/26788326
http://europepmc.org/abstract/MED/17317825
http://europepmc.org/abstract/MED/28481359
http://europepmc.org/abstract/MED/7946598
http://europepmc.org/abstract/MED/18602667
http://europepmc.org/abstract/MED/2648253
http://europepmc.org/abstract/MED/23888303
http://europepmc.org/abstract/MED/1890154
http://europepmc.org/abstract/MED/7951583