表21　1999年の超音波所見Type3の悪化群と不変群

LEGEND: Vil. ; village, Risk ; risk grade for reinfection,

Treatment ; 96=1996, 97×2=treated twice in 1997,

US findings ; 98sp=February to March, 1998 ;

98su=July to August, 1998

1=Type1, 2=Type2, 3=Type3

according to Ohmae(1992)

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