http://europepmc.org/abstract/MED/24310817
http://europepmc.org/abstract/MED/10861817
http://europepmc.org/abstract/MED/10773450
http://europepmc.org/abstract/MED/21239865
http://europepmc.org/abstract/MED/11477655
http://europepmc.org/abstract/MED/23859904
http://europepmc.org/abstract/MED/12433702
http://europepmc.org/abstract/MED/9168451
http://europepmc.org/abstract/MED/25861237
http://europepmc.org/abstract/MED/18633615
http://europepmc.org/abstract/MED/12399976
http://europepmc.org/abstract/MED/22994759
http://europepmc.org/abstract/MED/8152249
http://europepmc.org/abstract/MED/23317202
http://europepmc.org/abstract/MED/12651265
http://europepmc.org/abstract/MED/8443374
http://europepmc.org/abstract/MED/26856288
http://europepmc.org/abstract/MED/8358709
http://europepmc.org/abstract/MED/20051780
http://europepmc.org/abstract/MED/19488866
http://europepmc.org/abstract/MED/20113834
http://europepmc.org/abstract/MED/26925663
http://europepmc.org/abstract/MED/8414510
http://europepmc.org/abstract/MED/19665789
http://europepmc.org/abstract/MED/11368362
http://europepmc.org/abstract/MED/19579075