“…Despite the extensive empirical literature, main knowledge gaps persist. Most studies on the relationship between two types of care conceptualise formal home care as one variable without making a distinction among different components of home care (Byrne, Goeree, Hiedemann, & Stern, 2009;Cohen, Miller, & Weinrobe, 2001;Jacobs, Tilburg, Groenewegen, & Broese Van Groenou, 2016;Litwin & Attias-Donfut, 2009;Nordberg et al, 2005;Swinkels et al, 2016). Some studies assessed the impact of informal care on different types of formal care, such as home healthcare, nursing home care, hospital nights, outpatient surgery, and physician care (Bolin et al, 2008;Van Houtven & Norton, 2004).…”