Effectiveness of a Mobile App Intervention for Preparing Preschool Children and Parents for Day Surgery: Randomized Controlled Trial

Heli Kerimaa   ^{1, 2} , RN, MHSc ;   Mervi Hakala   ^{1, 2, 3} , MW, PhD ;   Marianne Haapea   ^{1, 4} , PhD ;   Hannu Vähänikkilä   ⁵ , PhD ;   Willy Serlo   ^{1, 6, 7} , PhD ;   Hong-Gu He   ^{8, 9} , PhD ;   Tarja Pölkki   ^{1, 2, 3} , RN, PhD

¹ Medical Research Center Oulu, Oulu University Hospital and University of Oulu, Oulu, Finland

² Research Unit of Health Sciences and Technology, University of Oulu, Oulu, Finland

³ Oulu University Hospital, Oulu, Finland

⁴ Research Service Unit, Oulu University Hospital, Oulu, Finland

⁵ Northern Finland Birth Cohorts, Arctic Biobank, Infrastructure for Population Studies, Faculty of Medicine, University of Oulu, Oulu, Finland

⁶ Division of Pediatric Surgery, Oulu University Hospital, Oulu, Finland, Oulu, Finland

⁷ Oulu University Unit of Clinical Medicine, University of Oulu, Oulu, Finland

⁸ Alice Lee Centre for Nursing Studies, Yong Loo Lin School of Medicine, National University of Singapore, Singapore, Singapore

⁹ National University Health System, Singapore, Singapore