method:
westergreen and witrobe method
normal values:
westergreen..male:1hour-3-5mm/hour 2hour:6-10mm/hour
female:1hour-8-10mm/hour 2haour:16-20mm/hour
witrobe...male : 15mm/hour
female : 20 mm/hour
significance:
prognostic not diognostic
~detect disease
~follow up disease and effect of the treatment
~give an idea about any disease
