Christensen E, 1981, Gastroenterology, 81, 944, 10.1016/S0016-5085(81)80123-0
Smith JL, 1982, Gastroenterology, 82, 968, 10.1016/S0016-5085(82)80264-3
10.1097/00005792-197201000-00002
10.1056/NEJM199105303242202
Groszmann RJ, 1990, Gastroenterology, 99, 1401, 10.1016/0016-5085(90)91168-6
10.1016/S0140-6736(95)91740-3
Silvain C, 1985, Gastroenterol Clin Biol, 9, 670
10.2165/00003495-199200442-00007
Lebrec D, 1982, N Engl J Med, 307, 560
Garcia-Pagan JC, 1991, Ann Intern Med, 115, 869, 10.7326/0003-4819-114-10-869
10.1016/S0140-6736(96)05406-2
10.1053/gast.1997.v113.agast971131794
10.1053/gast.1997.v113.pm9352866
10.1056/NEJM199106203242505
Fardy JM, 1994, Am J Gastroenterol, 89, 1938
Laine L, 1995, Ann Intern Med, 123, 280, 10.7326/0003-4819-123-4-199508150-00007
10.1016/S0168-8278(97)80248-6
10.1056/NEJM199206043262304
10.1097/00042737-199604000-00010
Conn HO, 1967, J Lab Clin Med, 70, 442
Sarin SK, 1992, Gastroenterology, 102, 994, 10.1016/0016-5085(92)90188-5
Altman DG. Practical statistics for medical research. London: Chapman & Hall, 1991.
Cox DR, 1972, J R Stat Soc [B], 34, 187
10.1056/NEJM198710013171403
Gimson A, 1990, Gastroenterology, 99, 1829, 10.1016/0016-5085(90)90495-M
10.1111/j.1572-0241.1998.00589.x