http://europepmc.org/abstract/MED/28481359
http://europepmc.org/abstract/MED/28978093
http://europepmc.org/abstract/MED/11746989
http://europepmc.org/abstract/MED/20544848
http://europepmc.org/abstract/MED/23471846
http://europepmc.org/abstract/MED/25344691
http://europepmc.org/abstract/MED/27543871