Additional file 1.

Test for breaking strength of incision. Step 1. Connecting the incision with an empty water container. Step 2. Draining the water gradually into the container until the incision is broken, then calculating the breaking strength by this formula (Breaking strength = the gravity of total water).

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Zhang et al. BMC Surgery 2011 11:5   doi:10.1186/1471-2482-11-5