Refrences

  1. Robert B. Wallace, MD, MSc, Maxy- Rosenau-Last, Public Health & Preventive Medicine 14th edition-1998
  2. Wallace LJD, Calhoun AD, Powell KE, O'Neil J, James SP, Atlanta:National Center for Injury Prev. & control 1993.
  3. Wilson ED:The diversity of life. Cambridge, MA: Harvard University Press, 1992
  4. WHO: International statistical classification of Diseases and Related Health Problems 10th ed. Geneva.1992

 

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