''All scientific work is incomplete - whether it be observational or experimental. All scientific work is liable to be upset or modified by advancing knowledge. That does not confer upon us a freedom to ignore the knowledge we already have, or to postpone action that it appears to demand at a given time'' (Hill, 1965).
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DIRECTORY DEV COOPERAT & HUMANITARIAN AID,SWISS DEV COOPERAT,CH-3003 BERN,SWITZERLANDDIRECTORY DEV COOPERAT & HUMANITARIAN AID,SWISS DEV COOPERAT,CH-3003 BERN,SWITZERLAND
KLOCKOW, S
HOFER, W
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DIRECTORY DEV COOPERAT & HUMANITARIAN AID,SWISS DEV COOPERAT,CH-3003 BERN,SWITZERLANDDIRECTORY DEV COOPERAT & HUMANITARIAN AID,SWISS DEV COOPERAT,CH-3003 BERN,SWITZERLAND