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              Gaertner B, Lüdtke D, Koschollek C et al. (2019) Effects of a sequential mixed-mode design on participation, contact and sample composition -Results of the pilot study "IMOA - Improving Health Monitoring in Old Age". Survey Methods: Insights from the Field (SMIF)
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              Gaertner B, Lüdtke D, Koschollek C et al. (2019) Effects of a sequential mixed-mode design on participation, contact and sample composition -Results of the pilot study "IMOA- Improving Health Monitoring in Old Age". Survey Methods: Insights from the Field (SMIF)
                 (xsd:string)
              
            
              Gaertner B, Lüdtke D, Koschollek C et al. (2019) Effects of a sequential mixed-mode design on participation, contact and sample composition -Results of the pilot study 'IMOA-Improv- ing Health Monitoring in Old Age'. Survey Insights: Methods from the Field (SMIF).
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              Gaertner, B., et al., Effects of a sequential mixed-mode design on participation, contact and sample composition -Result of the pilot study "IMOA -Improving Health Monitoring in Old Age" submitted.
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              Gaertner, B., Lüdtke, D., C, K., . (2019). Effects of a sequential mixed-mode design on participation, contact and sample composition -Results of the pilot study "IMOA - Improving Health Monitoring in Old Age".
                 (xsd:string)
              
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