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Austria, Denmark, Estonia, Finland, Germany, Iceland, Latvia (CAWI), Netherlands, Norway, Poland, Switzerland, Great Britain: "Don't know" and "No answer" ... »more»
(en)
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Austria, Denmark, Estonia, Finland, Germany, Iceland, Latvia (CAWI), Netherlands, Norway, Poland, Switzerland, Great Britain: "Don't know" and "No answer" ... »more»
(de)
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