http://europepmc.org/abstract/MED/22975805
http://europepmc.org/abstract/MED/29681454
http://europepmc.org/abstract/MED/28481359
http://europepmc.org/abstract/MED/29420467
http://europepmc.org/abstract/MED/18386774
http://europepmc.org/abstract/MED/28522754
http://europepmc.org/abstract/MED/15287030
http://europepmc.org/abstract/MED/27105513
http://europepmc.org/abstract/MED/27923066
http://europepmc.org/abstract/MED/22980975