1. Brace V, Penney G, Hall M. Quantifying severe maternal morbidity: a Scottish population study. BJOG. 2004;111(5):481–4.
2. Lewis G, Drife JO. Why mothers die 2000-2002: the sixth report of the confidential enquiries into maternal deaths in the United Kingdom. London: RCOG; 2004.
3. Lewis G. Saving mothers’ lives: reviewing maternal deaths to make motherhood safer–2003-2005: the seventh report of the confidential enquiries into Maternal Deaths in the United Kingdom. CEMACH; 2007. (www.cemach.org.uk).
4. Schneider AP II, Nelson DJ, Brow DD. In-hospital cardiopulmonary resuscitation: a 30-year review. J Am Board Fam Pract. 1993;6:91–101.
5. Pollard JB. Common mechanisms and strategies for prevention and treatment of cardiac arrest during epidural anesthesia. J Clin Anesth. 2002;14(1):52–6.