1Joanna Briggs Institute. Management of Constipation in Older Adults [M]. Best Practice:evidence-based practice information sheets for health professionals, 1999,3 ( 1 ) : 1-6.
2Ramkumar D,Rao SSCR. Efficacy and Safety of Traditional Medical Therapies for Chronic Constipation: Systematic Review [J]. Am J Gastroenterol, 2005,100 ( 4 ) : 936-971.
3Registered Nurses Association of Ontario(RNAO). Prevention of Constipation in the Older Adult Population[M]. Toronto(ON): Registered Nurses Association of Ontario(RNAO),2005:P24.
4The Joanna Briggs Institute. Systematic reviews-the review process,Levels of evidence. Accessed on-line 2006. http://www.joannabriggs.edu.au/ pubs/approach.php.
