http://europepmc.org/abstract/MED/28125452
http://europepmc.org/abstract/MED/24927217
http://europepmc.org/abstract/MED/19018267
http://europepmc.org/abstract/MED/16806438
http://europepmc.org/abstract/MED/22163003
http://europepmc.org/abstract/MED/17592266
http://europepmc.org/abstract/MED/7669582
http://europepmc.org/abstract/MED/8261457
http://europepmc.org/abstract/MED/23716351
http://europepmc.org/abstract/MED/23791828
http://europepmc.org/abstract/MED/21720365
http://europepmc.org/abstract/MED/19430562
http://europepmc.org/abstract/MED/7852189
http://europepmc.org/abstract/MED/25523272
http://europepmc.org/abstract/MED/8384077
http://europepmc.org/abstract/MED/12694651
http://europepmc.org/abstract/MED/22328975
http://europepmc.org/abstract/MED/23267135
http://europepmc.org/abstract/MED/19962665
http://europepmc.org/abstract/MED/22487539
http://europepmc.org/abstract/MED/10739698
http://europepmc.org/abstract/MED/20802181
http://europepmc.org/abstract/MED/1656759
http://europepmc.org/abstract/MED/22271473
http://europepmc.org/abstract/MED/22705003
http://europepmc.org/abstract/MED/25118479
http://europepmc.org/abstract/MED/23711666
http://europepmc.org/abstract/MED/10071245
http://europepmc.org/abstract/MED/23000388
http://europepmc.org/abstract/MED/19048115
http://europepmc.org/abstract/MED/9166952
http://europepmc.org/abstract/MED/23408974
http://europepmc.org/abstract/MED/12893203
http://europepmc.org/abstract/MED/24022196
http://europepmc.org/abstract/MED/8980248
http://europepmc.org/abstract/MED/28481359
http://europepmc.org/abstract/MED/26870997
http://europepmc.org/abstract/MED/8258728
http://europepmc.org/abstract/MED/27575406
http://europepmc.org/abstract/MED/28734796
http://europepmc.org/abstract/MED/22102435
http://europepmc.org/abstract/MED/21926912
http://europepmc.org/abstract/MED/9264581