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2. Allan Frank: Proc. Mayo-Clinic., Nov. 1931.
3. Ask Upmark: Acta chir. scand. (Stockh.)68, 74; Klin. Wschr.1932, 7.
4. Askanazy: Arb. path. anat. Inst. Tübingen1903, 4.
5. Ballin: Ann. Surg.10 (1931); Amer. J. Surg.6 (1931).