送交者: blackbox 于 2012-01-13, 16:11:09:

回答: if I remember correctly, these are all called "quality (control) study" 由 猎人 于 2012-01-13, 13:41:08:

• Questionare is OK, for the endpoint score - cornbug (68 bytes) 2012-01-13, 16:41:34 (641294)
  • I don't understand this"...development of symptoms....." (无内容) - 猎人 (0 bytes) 2012-01-13, 19:05:55 (641310)
    • The severity is a function of exposure time. (无内容) - cornbug (0 bytes) 2012-01-13, 23:25:16 (641333)
  • it may more sense by reading this and the one below - blackbox (176 bytes) 2012-01-13, 18:18:30 (641306)

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