References
- Jussila J. Scand J Gastroenterol 1969; 4: 361–368
- Isokoski M, Jussila J, Sama S. Gastroenterology 1972; 62: 28–32
- Newcomer A D, McGill D B, Thomas P J, Hofman A F. N Engl J Med 1975; 293: 1232–1236
- Krasilnikoff P A, Gudmand-Høyer E, Moltke H H. Acta Paediatr Scand 1975; 64: 693–698
- Arola H, Koivula T, Isokoski M. Lancet 1982; 1: 676
- Arola H, Koivula T, Jokela H, Isokoski M. Lancet 1982; 2: 524–525
- Dahlqvist A. Anal Biochem 1964; 7: 18–25
- Newcomer A D, McGill D B. Gastroenterology 1966; 51: 481–488
- Sackett D L, Haynes R B, Tugwell P. Clinical epidemiology, a basic science for clinical medicine. Little Brown and Co., Boston 1985
- Simoons F J. Dig Dis Sci 1978; 23: 963–980