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spec: In studies designed to evaluate therapies for life-threatening illness , risk of serious adverse effects may be acceptable . The floors are swept not vacuumed and washed about twice a year . The antidepressants are n't working and the doctor prescribes another one : it must be the fourth or fifth we have tried . The exceptions are CHOLSKY and TOMCATV , where over a third of the prefetched references are not found in the cache . The books are specially designed for students of GCE AS level , but the texts and exercises may be used at higher or lower levels , depending on the ability of the learner . Patients are managed on calcium channel blockers , inhaled nitric oxide and prostacyclin ( Flolan ) in this group practice . But , ironically , whenever a sacred cow is demolished by the biblical writers themselves , the Jehovah 's Witnesses twist the text and resort to an interpretive type of translation . The Commission on Human Rights can also pass resolutions arising from treaty body processes . The women were divided into two groups : Women in the study group were offered annual mammography screenings beginning at age 40 , while those in the control group were offered annual screenings beginning at age 50 .