http://europepmc.org/abstract/MED/7928628
http://europepmc.org/abstract/MED/25953157
http://europepmc.org/abstract/MED/9485035
http://europepmc.org/abstract/MED/22495314
http://europepmc.org/abstract/MED/24201163
http://europepmc.org/abstract/MED/28679691
http://europepmc.org/abstract/MED/22722201
http://europepmc.org/abstract/MED/10706127
http://europepmc.org/abstract/MED/25729435
http://europepmc.org/abstract/MED/16959974
http://europepmc.org/abstract/MED/1682043
http://europepmc.org/abstract/MED/25490678
http://europepmc.org/abstract/MED/25730902
http://europepmc.org/abstract/MED/23856246
http://europepmc.org/abstract/MED/10393358
http://europepmc.org/abstract/MED/8312582
http://europepmc.org/abstract/MED/27135926
http://europepmc.org/abstract/MED/16996204
http://europepmc.org/abstract/MED/15376261
http://europepmc.org/abstract/MED/26249178
http://europepmc.org/abstract/MED/26806567
http://europepmc.org/abstract/MED/17417968
http://europepmc.org/abstract/MED/11306511
http://europepmc.org/abstract/MED/27284958
http://europepmc.org/abstract/MED/16890317
http://europepmc.org/abstract/MED/10667421
http://europepmc.org/abstract/MED/27034166
http://europepmc.org/abstract/MED/9260591
http://europepmc.org/abstract/MED/16007576
http://europepmc.org/abstract/MED/11336244
http://europepmc.org/abstract/MED/28481359
http://europepmc.org/abstract/MED/29420467
http://europepmc.org/abstract/MED/28116522
http://europepmc.org/abstract/MED/23352210
http://europepmc.org/abstract/MED/25961742
http://europepmc.org/abstract/MED/28243898
http://europepmc.org/abstract/MED/21556624