“…4), e.g., after therapeutic head and neck irradiation (Guchelaar et al, 1997;Fox, 1998), autoimmune diseases (Gonzales and Coleman, 1999) such as Sjögren's syndrome (Boutsi et al, 2000), systemic lupus erythematosus (Rhodus and Johnson, 1990), progressive systemic sclerosis (Osial et al, 1983;Wood and Lee, 1988), primary or secondary amyloidosis (al Hashimi et al, 1987;Richey and Bennion, 1996), sarcoidosis (Drosos et al, 1989;Sack et al, 1998), infectious diseases such as HIV (Kordossis et al, 1998) andhepatitis C (al Hashimi, 2001), or diabetes mellitus (Darnell and Saunders, 1990;Rees, 2000), and can be induced by over 400 drugs, including tricyclic antidepressants, antihistamines, and diuretics (Sreebny and Schwartz, 1997). The most prominent causes of reduced salivary flow are therapeutic pharmaceutical side-effects (Schein et al, 1999).…”