becher, 1923;Thomsen, 1927;Burrows, 1938;Poznanski et al, 1971) and the findings give the ratio between the proximal and distal ones as about 1: 0.75. In the case of DBT we have found a ratio between 1: 0.35 and 1: 0.4, but this may vary; there are reports of a normal ratio (1:0.68) and a short ratio (1: 0.44) in the same patient (Villaverde, 1943
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