http://europepmc.org/abstract/MED/10547570
http://europepmc.org/abstract/MED/28481359
http://europepmc.org/abstract/MED/26437033
http://europepmc.org/abstract/MED/26832993
http://europepmc.org/abstract/MED/25593300
http://europepmc.org/abstract/MED/27255162