http://europepmc.org/abstract/MED/7579458
http://europepmc.org/abstract/MED/8562933
http://europepmc.org/abstract/MED/9209648
http://europepmc.org/abstract/MED/8558920
http://europepmc.org/abstract/MED/7742546
http://europepmc.org/abstract/MED/8683377
http://europepmc.org/abstract/MED/8781433
http://europepmc.org/abstract/MED/7527617
http://europepmc.org/abstract/MED/8781434
http://europepmc.org/abstract/MED/7662979
http://europepmc.org/abstract/MED/9274957
http://europepmc.org/abstract/MED/9269795