1. Partnership to Fight Chronic Disease. 2009 Almanac of chronic disease. http://www.fightchronicdisease.org/sites/default/files/docs/2009AlmanacofChronicDisease_updated81009.pdf (2009).
2. King, D. E., Xiang, J. & Pilkerton, C. S. Multimorbidity trends in United States adults, 1988–2014. J. Am. Board Fam. Med. 31, 503–513 (2018).
3. World Health Organization. WHO reveals leading causes of death and disability worldwide: 2000-2019. https://www.who.int/news/item/09-12-2020-who-reveals-leading-causes-of-death-and-disability-worldwide-2000-2019 (2020).
4. Meraya, A. M. & Sambamoorthi, U. Chronic condition combinations and productivity loss among employed nonelderly adults (18 to 64 years). J. Occup. Environ. Med. 58, 974–978 (2016).
5. Anand, A. Chronic disease management market growth statistics, emerging trends, sales insights, research overview, COVID-19 impact and regional outlook by 2025. https://www.medgadget.com/2020/11/chronic-disease-management-market-growth-statistics-emerging-trends-sales-insights-research-overview-covid-19-impact-and-regionaloutlook-by-2025.html (2020).