Direct costs for the aggressive warming
(1) Medical supplies: Imported disposable forced-air warming blanket (3 M™ Bair Hugger™ 635) was priced at 74.34 USD per piece, and was acquired directly from the 3 M company and (2) Energy cost: Considering the rated power and usage time, the electricity bill for the forced-air warming system was 0.3 USD/h.