Using WhatsApp for Nutrition Surveillance Among Children Under 5 Years in West Java, Indonesia: Cross-Sectional Survey and Feasibility Study

Dewi Nur Aisyah   ^{1, 2, 3, 4 *} , PhD ;   Chyntia Aryanti Mayadewi   ^{2 *} , MSc ;   Astri Utami   ^{2 *} , BSc ;   Fauziah Mauly Rahman   ^{2, 5 *} , BSc ;   Nathasya Humaira Adriani   ^{2 *} , BSc ;   Erlangga Al Farozi   ^{2 *} , MTI ;   Meldi Hafizh Sayoko   ^{6 *} , MSc ;   Aulia Chairunisa   ^{2 *} , BSc ;   Liza Restiana   ^{7 *} , MD ;   Logan Manikam   ^{1, 3 *} , PhD ;   Zisis Kozlakidis   ^{8 *} , PhD

¹ Department of Epidemiology and Public Health, Institute of Epidemiology and Health Care, University College London, London, United Kingdom

² Digital Transformation Office, Ministry of Health, Republic of Indonesia, Jakarta, Indonesia

³ Aceso Global Health Consultants Pte Limited, Singapore, Singapore

⁴ Department of Public Health, Monash University Indonesia, Tangerang, Indonesia

⁵ School of Computer Science, Faculty of Engineering, University of Sydney, Camperdown, NSW, Australia

⁶ Department of Science, Technology and Innovation Studies, School of Social and Political Science, University of Edinburgh, Edinburgh, United Kingdom

⁷ Ciderum Community Health Center, Caringin Subdistrict, Bogor, Indonesia

⁸ International Agency for Research on Cancer World Health Organization, Lyon, France

*all authors contributed equally