There is a golden rule in parallelism that whenever there are more than one factor, we must check whether there is a factor that causes the other factor/factors. If so, we must express the casual clause with a tensed verb, while the resultant factor/ factors should be expressed in a modified form, mostly comma plus verbing format.
In this case, the necessity of spending less time with each patient arises because the rule requires doctors to see more patients within a given time to reduce costs.
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In this case, the necessity of spending less time with each patient arises because the rule requires doctors to see more patients within a given time to reduce costs.
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