http://europepmc.org/abstract/MED/1338904 http://europepmc.org/abstract/MED/28577310 http://europepmc.org/abstract/MED/17454753 http://europepmc.org/abstract/MED/28002797 http://europepmc.org/abstract/MED/11127266 http://europepmc.org/abstract/MED/27578919 http://europepmc.org/abstract/MED/1651563 http://europepmc.org/abstract/MED/17257127 http://europepmc.org/abstract/MED/24599305 http://europepmc.org/abstract/MED/28073006 http://europepmc.org/abstract/MED/12408524 http://europepmc.org/abstract/MED/24951259 http://europepmc.org/abstract/MED/9020916 http://europepmc.org/abstract/MED/29029407 http://europepmc.org/abstract/MED/23907151 http://europepmc.org/abstract/MED/30200630 http://europepmc.org/abstract/MED/28548125 http://europepmc.org/abstract/MED/24894453 http://europepmc.org/abstract/MED/21380628 http://europepmc.org/abstract/MED/12374230 http://europepmc.org/abstract/MED/10638959 http://europepmc.org/abstract/MED/23085758 http://europepmc.org/abstract/MED/26434631 http://europepmc.org/abstract/MED/27149842 http://europepmc.org/abstract/MED/11819789 http://europepmc.org/abstract/MED/15251969 http://europepmc.org/abstract/MED/1528264