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/27923066
http://europepmc.org/abstract/MED/23033341
http://europepmc.org/abstract/MED/22980975
http://europepmc.org/abstract/MED/22696596