http://europepmc.org/abstract/MED/10468914
http://europepmc.org/abstract/MED/17317825
http://europepmc.org/abstract/MED/29085338
http://europepmc.org/abstract/MED/27717198
http://europepmc.org/abstract/MED/2183158
http://europepmc.org/abstract/MED/28975450
http://europepmc.org/abstract/MED/7559096
http://europepmc.org/abstract/MED/2648253