1 Never use a microwave or conventional oven to pre-heat your flask. 2  If your flask has not been used for some time, rinse with warm water to remove any residual odours.  DO NOT overfill your flask. Leave sufficient space in the neck to fit the stopper.
Prevalence is a measure of disease that allows us to determine a person's likelihood of having a disease. Therefore, the number of prevalent cases is the total number of cases of disease existing in a population.
WHO definition of Health. Health is a state of complete physical, mental and social well-being and not merely the absence of disease or infirmity.The correct bibliographic citation for the definition is:ealth is a state of complete physical, mental and social well-being and not merely the absence of disease or infirmity.