1Amal Chandran R. Seminar Report- Business process reengineering[R]. 2001 : 28-29.
2Edlow JA,Panagos PD,Godwin SA,et al.Clinical policy:critical issues in the evaluation and management of adult patients presenting to the emergency department with acute headache.Ann Emerg Med,2008,52:407-436.
3Carragee EJ.Clinical practice.Persistent low back pain.N Engl J Med,2005,352:1891-1898.
