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2Goodlin, 1979.
3de Vries et al., 1988; Visser et al., 1992.
4Bates, 1987; Liley, 1972; Humphrey, 1970; Goodlin and Lowe, 1974; de Vries et al., 1982.
5de Vries et al., 1982.
6Humphrey, 1964; Humphrey, 1970.
7Liley, 1986; Liley, 1972; Petrikovsky et al., 1995; de Vries et al., 1982; Campbell, 2004.
8Robinson and Tizard, 1966; de Vries et al., 1982; de Vries et al., 1982; Valman and Pearson, 1980.
9Robinson and Tizard, 1966; Valman and Pearson, 1980.
10Goodlin, 1979; Humphrey, 1964.
11de Vries et al., 1982.
12Hepper et al., 1991.
13Mancia, 1981; Bates, 1979.
14Sorokin and Dierker, 1982; Timor-Tritsch et al., 1976; Spraycar, 1995; Leader, 1995.
15Liley, 1972.
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