http://europepmc.org/abstract/MED/10862049
http://europepmc.org/abstract/MED/26214590
http://europepmc.org/abstract/MED/9462707
http://europepmc.org/abstract/MED/20544847
http://europepmc.org/abstract/MED/26286987
http://europepmc.org/abstract/MED/18505964
http://europepmc.org/abstract/MED/19799798
http://europepmc.org/abstract/MED/22493355
http://europepmc.org/abstract/MED/23444215
http://europepmc.org/abstract/MED/15195137
http://europepmc.org/abstract/MED/10380936
http://europepmc.org/abstract/MED/7700630
http://europepmc.org/abstract/MED/22622578
http://europepmc.org/abstract/MED/22817889
http://europepmc.org/abstract/MED/23851445
http://europepmc.org/abstract/MED/9036865
http://europepmc.org/abstract/MED/7585628
http://europepmc.org/abstract/MED/20703244
http://europepmc.org/abstract/MED/9354451
http://europepmc.org/abstract/MED/23907151
http://europepmc.org/abstract/MED/11507043
http://europepmc.org/abstract/MED/10233780
http://europepmc.org/abstract/MED/25452114
http://europepmc.org/abstract/MED/21499247
http://europepmc.org/abstract/MED/12107107
http://europepmc.org/abstract/MED/8938142
http://europepmc.org/abstract/MED/8895759
http://europepmc.org/abstract/MED/28481359
http://europepmc.org/abstract/MED/29420467
http://europepmc.org/abstract/MED/24628946
http://europepmc.org/abstract/MED/10338330
http://europepmc.org/abstract/MED/24569790
http://europepmc.org/abstract/MED/17260012
http://europepmc.org/abstract/MED/7478563