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. 1987 May 1;136(9):927–928.
Questionnaire development: 4. Preparation for analysis.
W Walop
, L Del Greco
, L Eastridge
, B Marchand
, K Szentveri
W Walop
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L Del Greco
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L Eastridge
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B Marchand
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K Szentveri
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PMCID: PMC1491961 PMID: 3567808