TY - JOUR T1 - Switching to Self-Completion Protocols Impacts Item Nonresponse Patterns. Lessons from the European Social Survey rounds 9, 10 and 11 JO - International Journal of Social Research Methodology PY - 2026/04/10 AU - Jabkowski P AU - Cichocki P AU - Piekut A ED - DO - DOI: 10.1080/13645579.2026.2680975 PB - Taylor and Francis Group Y2 - 2026/05/28 ER -