http://europepmc.org/abstract/MED/28481359
http://europepmc.org/abstract/MED/11764090
http://europepmc.org/abstract/MED/22844452
http://europepmc.org/abstract/MED/28270234
http://europepmc.org/abstract/MED/25078279
http://europepmc.org/abstract/MED/25257301
http://europepmc.org/abstract/MED/24880341