http://europepmc.org/abstract/MED/12719725
http://europepmc.org/abstract/MED/26053404
http://europepmc.org/abstract/MED/26675346
http://europepmc.org/abstract/MED/11468183
http://europepmc.org/abstract/MED/8241511
http://europepmc.org/abstract/MED/14726385
http://europepmc.org/abstract/MED/25480502
http://europepmc.org/abstract/MED/25605254