E:


( 80-85%) , - - . , , , , ( ), [ Basil ea 1983 , Reardon ea 1988 ].

, . , , - , -194 [ Wernene-Hammond ea 1987 ].

, -, . , , , , , , [ Hussain ea 1988 , Hussain ea 1989 ]. , 50% "" . , , .

:

  • E: