http://europepmc.org/abstract/MED/16014569
http://europepmc.org/abstract/MED/23091097
http://europepmc.org/abstract/MED/26053404
http://europepmc.org/abstract/MED/21993670
http://europepmc.org/abstract/MED/24920063
http://europepmc.org/abstract/MED/28481359
http://europepmc.org/abstract/MED/26675346
http://europepmc.org/abstract/MED/23585524
http://europepmc.org/abstract/MED/24550227
http://europepmc.org/abstract/MED/10023947
http://europepmc.org/abstract/MED/25480502
http://europepmc.org/abstract/MED/24584352
http://europepmc.org/abstract/MED/23415222
http://europepmc.org/abstract/MED/10397742