http://europepmc.org/abstract/MED/22037554
http://europepmc.org/abstract/MED/28481359
http://europepmc.org/abstract/MED/30239046
http://europepmc.org/abstract/MED/24861525
http://europepmc.org/abstract/MED/10878546
http://europepmc.org/abstract/MED/22723903
http://europepmc.org/abstract/MED/25778705
http://europepmc.org/abstract/MED/12378616
http://europepmc.org/abstract/MED/26489445