Improving Understanding of Participation and Attrition Phenomena in European Cohort Studies: Protocol for a Multi-Situated Qualitative Study

Sandra C S Marques   ^{1, 2} , PhD ;   Julia Doetsch   ^{1, 3} , MSc ;   Anne Brødsgaard   ⁴ , PhD ;   Marina Cuttini   ⁵ , MD, PhD ;   Elizabeth S Draper   ⁶ , PhD ;   Eero Kajantie   ^{7, 8, 9, 10} , MD, PhD ;   Jo Lebeer   ¹¹ , MD, PhD ;   Sylvia van der Pal   ¹² , PhD ;   Pernille Pedersen   ⁴ , MD ;   RECAP - WP6 QS Work Group   ¹³ ;   Henrique Barros   ^{1, 14} , MD, PhD

¹ EPIUnit, Instituto de Saúde Pública da Universidade do Porto, Universidade do Porto, Porto, Portugal

² Centro em Rede de Investigação em Antropologia, Instituto Universitário de Lisboa, Lisbon, Portugal

³ School of Public Health and Primary Care, Faculty of Health, Medicine and Life Sciences, Maastricht University, Maastricht, The Netherlands

⁴ Department of Paediatrics and Adolescent Medicine, Copenhagen University Hospital Amager Hvidovre, Copenhagen, Denmark

⁵ Research Unit of Perinatal Epidemiology, Clinical Care and Management Innovation Research Area, Ospedale Pediatrico Bambino Gesù Institute for Research Hospitalization and Health Care, Rome, Italy

⁶ Department of Health Sciences, College of Life Sciences, University of Leicester, Leicester, United Kingdom

⁷ Public Health Promotion Unit, National Institute for Health and Welfare, Helsinki, Finland

⁸ PEDEGO Research Unit, MRC Oulu, University of Oulu and Oulu University Hospital, Oulu, Finland

⁹ Department of Clinical and Molecular Medicine, Norwegian University for Science and Technology, Trondheim, Norway

¹⁰ Children’s Hospital, Helsinki University Hospital, Helsinki, Finland

¹¹ Department ELIZA Primary & Interdisciplinary Care, Faculty of Medicine & Health Sciences University of Antwerp, Antwerp, Belgium

¹² TNO Child Health, Leiden, The Netherlands

¹³ see Acknowledgments, delete, Angola

¹⁴ Departamento de Ciências da Saúde Pública e Forenses e Educação Médica, Faculdade de Medicina, Universidade do Porto, Porto, Portugal