http://europepmc.org/abstract/MED/10846560
http://europepmc.org/abstract/MED/16647949
http://europepmc.org/abstract/MED/24388756
http://europepmc.org/abstract/MED/23297126
http://europepmc.org/abstract/MED/1375111
http://europepmc.org/abstract/MED/12217802
http://europepmc.org/abstract/MED/9354678
http://europepmc.org/abstract/MED/28481359
http://europepmc.org/abstract/MED/29386642
http://europepmc.org/abstract/MED/21796119
http://europepmc.org/abstract/MED/10760686
http://europepmc.org/abstract/MED/17699855
http://europepmc.org/abstract/MED/10956404