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TIME OF ADMISSION
AND DURATION OF HOSPITAL STAY HAS ALSO TO BE CONSIDERED WHILE SELECTING THE
CASES.
HOSPITAL CASES WILL BE USUALLY OF ADVANCED STAGE OF DISEASE AND THIS FACTOR SHOULD BE KEPT IN MIND WHILE SELECTING THE CASES OTHERWISE IT WILL LEAD TO SELECTION BIAS (ERROR). IF POSSIBLE, IT IS ALWAYS ADVISABLE TO SELECT ALL CASES FROM SIMILAR ENVIRONMENTAL EXPOSURE.
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