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Of these nearly 80% occur in low and middle-income countries

The former is driven by the oxygen concentration gradient and tortuosity of the microscopic pores within the structure, whereas the latter is controlled by forced air flow (pressure difference) and dominated by the presence of large pores or holes

doi:10.1002/14651858.CD002928.pub4

Left and right sides: 100 ARDATH CORK Measurements H 108, W 148, D 36 mm Subject and Association Keywords Object Type Object number 2024.1.77 Rights and permissions for this content Rights Add comment This object is from This object is in 1 community Tags Include tags such as place names, people, dates, events and colours