http://europepmc.org/abstract/MED/23528559
http://europepmc.org/abstract/MED/29420467
http://europepmc.org/abstract/MED/25505230
http://europepmc.org/abstract/MED/26763250
http://europepmc.org/abstract/MED/28577310
http://europepmc.org/abstract/MED/23104009
http://europepmc.org/abstract/MED/27894751
http://europepmc.org/abstract/MED/26181000
http://europepmc.org/abstract/MED/26648449
http://europepmc.org/abstract/MED/26172027