http://europepmc.org/abstract/MED/28481359
http://europepmc.org/abstract/MED/29420467
http://europepmc.org/abstract/MED/24121792
http://europepmc.org/abstract/MED/28548125
http://europepmc.org/abstract/MED/29136510
http://europepmc.org/abstract/MED/25225064
http://europepmc.org/abstract/MED/28945843