http://europepmc.org/abstract/MED/27149842
http://europepmc.org/abstract/MED/24755471
http://europepmc.org/abstract/MED/27121310
http://europepmc.org/abstract/MED/29420467
http://europepmc.org/abstract/MED/24211491
http://europepmc.org/abstract/MED/30200630
http://europepmc.org/abstract/MED/24599305
http://europepmc.org/abstract/MED/28548125
http://europepmc.org/abstract/MED/23700467
http://europepmc.org/abstract/MED/25786087
http://europepmc.org/abstract/MED/24951259
http://europepmc.org/abstract/MED/26488212
http://europepmc.org/abstract/MED/29029407