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Book Description Hardcover. Condition: Very Good. Dust Jacket Condition: No Dust Jacket. 8" x 5.5", 151pp. Heyns was a South African obstetrician who claimed to discover abdominal decompression, Rorvik was a journalist and author who often wrote about controversial and unproven theories around reproduction, including cloning and choosing the sex of a baby. ; The decompression method consists of placing a rigid dome around the abdomen, with the inside being decompressed to -50 to -100 mmHg for 15 to 30 seconds out of each minute for 30 minutes, one to three times daily, or continuously during labor. Seller Inventory # 128117