“…However, using direct cannulation of the bile duct is not suitable when investigating over a longer period of time as the direct bile cannulation only works for a short time (Corring, 1980;Sambrook, 1981). The variation in daily bile output from 1.41-2.91 found in this investigation is within reported values (Laplace and Ouassi, 1977;Juste et al, 1979;Aliev and Khamzatov, 1980;Sambrook 1981, Juste et al, 1983Kulig et al, 1989;Corring et al, 1990).…”