Abstract
References
1.
Petersdorf R.G.
1983 ) Harrison's Principles of Internal Medicine. 10th edn. McGraw-Hill , New York
2.
Weatherall D.J.
1983 ) Oxford Textbook of Medicine (2 vols). Oxford University Press
3.
Wyngaarden J.B.
, &
Smith L.H.
(1982 ) Cecil's Textbook of Medicine. 16th edn. W B Saunders , Philadelphia