http://europepmc.org/abstract/MED/7630645
http://europepmc.org/abstract/MED/29615459
http://europepmc.org/abstract/MED/18310288
http://europepmc.org/abstract/MED/2183158
http://europepmc.org/abstract/MED/19487299
http://europepmc.org/abstract/MED/24862939
http://europepmc.org/abstract/MED/18000091
http://europepmc.org/abstract/MED/21498916
http://europepmc.org/abstract/MED/27824297
http://europepmc.org/abstract/MED/3293774
http://europepmc.org/abstract/MED/12947056
http://europepmc.org/abstract/MED/19082310
http://europepmc.org/abstract/MED/17943694
http://europepmc.org/abstract/MED/8936664
http://europepmc.org/abstract/MED/29469959
http://europepmc.org/abstract/MED/7985080
http://europepmc.org/abstract/MED/21796448
http://europepmc.org/abstract/MED/25487739
http://europepmc.org/abstract/MED/24798740
http://europepmc.org/abstract/MED/2011403
http://europepmc.org/abstract/MED/22675538
http://europepmc.org/abstract/MED/22241789
http://europepmc.org/abstract/MED/9851250
http://europepmc.org/abstract/MED/17317825
http://europepmc.org/abstract/MED/28502101
http://europepmc.org/abstract/MED/28481359
http://europepmc.org/abstract/MED/10614528
http://europepmc.org/abstract/MED/17786355
http://europepmc.org/abstract/MED/30361901
http://europepmc.org/abstract/MED/7946598
http://europepmc.org/abstract/MED/27566247
http://europepmc.org/abstract/MED/15356022
http://europepmc.org/abstract/MED/29144541
http://europepmc.org/abstract/MED/21726664