http://europepmc.org/abstract/MED/24997986
http://europepmc.org/abstract/MED/15915369
http://europepmc.org/abstract/MED/28481359
http://europepmc.org/abstract/MED/10962865
http://europepmc.org/abstract/MED/24185509
http://europepmc.org/abstract/MED/27566247
http://europepmc.org/abstract/MED/9568784
http://europepmc.org/abstract/MED/29360550
http://europepmc.org/abstract/MED/15154647