http://europepmc.org/abstract/MED/28481359
http://europepmc.org/abstract/MED/29420467
http://europepmc.org/abstract/MED/24777035
http://europepmc.org/abstract/MED/24121792
http://europepmc.org/abstract/MED/24192927
http://europepmc.org/abstract/MED/29136510