http://europepmc.org/abstract/MED/25070294 http://europepmc.org/abstract/MED/26286987 http://europepmc.org/abstract/MED/18384130 http://europepmc.org/abstract/MED/16470173 http://europepmc.org/abstract/MED/25695693 http://europepmc.org/abstract/MED/9065403 http://europepmc.org/abstract/MED/22622578 http://europepmc.org/abstract/MED/23851445 http://europepmc.org/abstract/MED/22817889 http://europepmc.org/abstract/MED/8642260 http://europepmc.org/abstract/MED/23239741 http://europepmc.org/abstract/MED/25515853 http://europepmc.org/abstract/MED/26744134 http://europepmc.org/abstract/MED/24714776 http://europepmc.org/abstract/MED/10027390 http://europepmc.org/abstract/MED/28481359 http://europepmc.org/abstract/MED/22515704 http://europepmc.org/abstract/MED/22536370 http://europepmc.org/abstract/MED/23489693 http://europepmc.org/abstract/MED/25705882 http://europepmc.org/abstract/MED/24628946 http://europepmc.org/abstract/MED/24803579 http://europepmc.org/abstract/MED/21726664