1. Patient Safety Alerts NPSA/2009/PSA004A Safer Spinal (intrathecal), Epidural and Regional Devices http://www.nrls.npsa.nhs.uk/resources/?entryid45=65259&p=3
2. World Health Organization Information Exchange System http://www.who.int/patientsafety/highlights/PS_alert_115_vincristine.pdf