21.   Interferon, a costly drug in Thailand, is the therapy of choice for chronic HBV carriers.

22.   The development of these new drugs has created new hope for AIDS patients but also concerns among sufferers because of limited quantities of the costly drugs.

a. + drug >>共 1007
new 8.41%
illegal 5.80%
performance-enhancing 2.14%
generic 1.95%
illicit 1.51%
suspected 1.47%
major 1.39%
international 1.14%
banned 1.10%
intravenous 1.09%
costly 0.13%
costly + n. >>共 830
mistake 4.49%
error 1.92%
one 1.67%
litigation 1.20%
project 1.20%
lawsuit 1.15%
penalty 1.07%
process 0.98%
battle 0.94%
drug 0.94%
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