http://europepmc.org/abstract/MED/25957691
http://europepmc.org/abstract/MED/29844865
http://europepmc.org/abstract/MED/28481359
http://europepmc.org/abstract/MED/11085541
http://europepmc.org/abstract/MED/26071483
http://europepmc.org/abstract/MED/25344691