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Randomisation is necessary to disentangle intrinsic patient risk from effects of care.
Occult blood loss is clinically important. Ranitidine and gastrointestinal bleeding in intensive care. Should prophylaxis against stress ulcer be abondoned for patients in intensive care. Census of availability of neonatal intensive care should have used different denominator. Ranitidine or sucralfate do not prevent stress ulcer in intensive care patients.