http://europepmc.org/abstract/MED/28481359
http://europepmc.org/abstract/MED/22805857
http://europepmc.org/abstract/MED/1739910
http://europepmc.org/abstract/MED/2153451
http://europepmc.org/abstract/MED/29360550
http://europepmc.org/abstract/MED/23391413