http://europepmc.org/abstract/MED/23826216
http://europepmc.org/abstract/MED/22588899
http://europepmc.org/abstract/MED/21913188
http://europepmc.org/abstract/MED/19915484
http://europepmc.org/abstract/MED/26919320
http://europepmc.org/abstract/MED/20820872
http://europepmc.org/abstract/MED/20514489
http://europepmc.org/abstract/MED/21558404
http://europepmc.org/abstract/MED/20431032
http://europepmc.org/abstract/MED/22113362
http://europepmc.org/abstract/MED/21710625
http://europepmc.org/abstract/MED/23307057
http://europepmc.org/abstract/MED/29527387
http://europepmc.org/abstract/MED/24086756
http://europepmc.org/abstract/MED/22844452
http://europepmc.org/abstract/MED/20077503
http://europepmc.org/abstract/MED/22360629
http://europepmc.org/abstract/MED/27441955
http://europepmc.org/abstract/MED/24311631
http://europepmc.org/abstract/MED/23600211
http://europepmc.org/abstract/MED/25257301
http://europepmc.org/abstract/MED/22825915
http://europepmc.org/abstract/MED/23840696
http://europepmc.org/abstract/MED/23764841
http://europepmc.org/abstract/MED/26617880
http://europepmc.org/abstract/MED/23417712
http://europepmc.org/abstract/MED/28874004
http://europepmc.org/abstract/MED/19435942
http://europepmc.org/abstract/MED/25085214
http://europepmc.org/abstract/MED/22015945
http://europepmc.org/abstract/MED/23881452
http://europepmc.org/abstract/MED/22821383
http://europepmc.org/abstract/MED/24714777
http://europepmc.org/abstract/MED/21569770
http://europepmc.org/abstract/MED/22426639
http://europepmc.org/abstract/MED/22591444
http://europepmc.org/abstract/MED/23486690
http://europepmc.org/abstract/MED/24004584
http://europepmc.org/abstract/MED/24030748
http://europepmc.org/abstract/MED/24140581
http://europepmc.org/abstract/MED/27460417
http://europepmc.org/abstract/MED/23330999
http://europepmc.org/abstract/MED/28481359
http://europepmc.org/abstract/MED/28042970
http://europepmc.org/abstract/MED/23072665
http://europepmc.org/abstract/MED/21643842
http://europepmc.org/abstract/MED/24242757
http://europepmc.org/abstract/MED/21107199
http://europepmc.org/abstract/MED/21760534
http://europepmc.org/abstract/MED/22978341
http://europepmc.org/abstract/MED/24880341
http://europepmc.org/abstract/MED/23451940