http://europepmc.org/abstract/MED/26900293
http://europepmc.org/abstract/MED/27149842
http://europepmc.org/abstract/MED/22327622
http://europepmc.org/abstract/MED/28481359
http://europepmc.org/abstract/MED/10479724
http://europepmc.org/abstract/MED/30200630
http://europepmc.org/abstract/MED/24951259
http://europepmc.org/abstract/MED/24599305
http://europepmc.org/abstract/MED/23700467
http://europepmc.org/abstract/MED/23139211
http://europepmc.org/abstract/MED/10340381