http://europepmc.org/abstract/MED/29413684
http://europepmc.org/abstract/MED/22402123
http://europepmc.org/abstract/MED/22538770
http://europepmc.org/abstract/MED/25695693
http://europepmc.org/abstract/MED/27284958
http://europepmc.org/abstract/MED/20959826
http://europepmc.org/abstract/MED/12068308
http://europepmc.org/abstract/MED/2642738
http://europepmc.org/abstract/MED/20664172
http://europepmc.org/abstract/MED/20551065
http://europepmc.org/abstract/MED/27535334
http://europepmc.org/abstract/MED/28481359
http://europepmc.org/abstract/MED/23739063
http://europepmc.org/abstract/MED/22722201
http://europepmc.org/abstract/MED/20530683
http://europepmc.org/abstract/MED/2405551
http://europepmc.org/abstract/MED/23830926
http://europepmc.org/abstract/MED/17314276
http://europepmc.org/abstract/MED/7872685
http://europepmc.org/abstract/MED/2188722