http://europepmc.org/abstract/MED/10735894
http://europepmc.org/abstract/MED/11389067
http://europepmc.org/abstract/MED/17456604
http://europepmc.org/abstract/MED/10793107
http://europepmc.org/abstract/MED/23718828
http://europepmc.org/abstract/MED/8398064
http://europepmc.org/abstract/MED/26925973
http://europepmc.org/abstract/MED/12211048
http://europepmc.org/abstract/MED/10802655
http://europepmc.org/abstract/MED/7854378
http://europepmc.org/abstract/MED/16024113
http://europepmc.org/abstract/MED/17079356
http://europepmc.org/abstract/MED/15390206
http://europepmc.org/abstract/MED/18094376
http://europepmc.org/abstract/MED/16139561
http://europepmc.org/abstract/MED/28961834
http://europepmc.org/abstract/MED/23873848
http://europepmc.org/abstract/MED/9792155
http://europepmc.org/abstract/MED/10637254
http://europepmc.org/abstract/MED/15113040
http://europepmc.org/abstract/MED/25056374
http://europepmc.org/abstract/MED/12726864
http://europepmc.org/abstract/MED/8980360
http://europepmc.org/abstract/MED/25275298
http://europepmc.org/abstract/MED/28481359
http://europepmc.org/abstract/MED/10962443