http://europepmc.org/abstract/MED/26645239
http://europepmc.org/abstract/MED/28619094
http://europepmc.org/abstract/MED/1656362
http://europepmc.org/abstract/MED/8794405
http://europepmc.org/abstract/MED/20668451
http://europepmc.org/abstract/MED/26168399
http://europepmc.org/abstract/MED/28481359
http://europepmc.org/abstract/MED/15161705
http://europepmc.org/abstract/MED/8142008
http://europepmc.org/abstract/MED/1312896
http://europepmc.org/abstract/MED/1347094
http://europepmc.org/abstract/MED/17046168
http://europepmc.org/abstract/MED/7549812
http://europepmc.org/abstract/MED/20016488
http://europepmc.org/abstract/MED/22941189
http://europepmc.org/abstract/MED/22941188
http://europepmc.org/abstract/MED/10582680
http://europepmc.org/abstract/MED/23033341
http://europepmc.org/abstract/MED/15564288
http://europepmc.org/abstract/MED/10091733
http://europepmc.org/abstract/MED/22696596