http://europepmc.org/abstract/MED/10735894
http://europepmc.org/abstract/MED/25275298
http://europepmc.org/abstract/MED/16024113
http://europepmc.org/abstract/MED/28481359
http://europepmc.org/abstract/MED/17079356
http://europepmc.org/abstract/MED/10637254
http://europepmc.org/abstract/MED/23718828
http://europepmc.org/abstract/MED/16139561
http://europepmc.org/abstract/MED/23873848
http://europepmc.org/abstract/MED/25056374
http://europepmc.org/abstract/MED/8980360