http://europepmc.org/abstract/MED/7614480
http://europepmc.org/abstract/MED/11020858
http://europepmc.org/abstract/MED/24077944
http://europepmc.org/abstract/MED/10753186
http://europepmc.org/abstract/MED/23525077
http://europepmc.org/abstract/MED/1868473
http://europepmc.org/abstract/MED/11141476
http://europepmc.org/abstract/MED/22877736
http://europepmc.org/abstract/MED/17982662
http://europepmc.org/abstract/MED/12637159
http://europepmc.org/abstract/MED/17849424
http://europepmc.org/abstract/MED/10392633
http://europepmc.org/abstract/MED/10674608
http://europepmc.org/abstract/MED/9649454
http://europepmc.org/abstract/MED/8697989
http://europepmc.org/abstract/MED/10955797
http://europepmc.org/abstract/MED/8467510
http://europepmc.org/abstract/MED/9460999
http://europepmc.org/abstract/MED/23318448
http://europepmc.org/abstract/MED/16477636
http://europepmc.org/abstract/MED/16416221
http://europepmc.org/abstract/MED/25070024
http://europepmc.org/abstract/MED/15257314
http://europepmc.org/abstract/MED/11353048
http://europepmc.org/abstract/MED/28481359
http://europepmc.org/abstract/MED/29420467
http://europepmc.org/abstract/MED/8280379
http://europepmc.org/abstract/MED/10753204
http://europepmc.org/abstract/MED/8194706