“…This is because UHN can identify barriers to healthcare access that might not be determined by other measures from the healthcare services supply side, such as the presence of healthcare facilities, outpatient visits, and hospital admission rates (Chen & Hou, 2002;Jung & Ha, 2021;Meemon & Paek, 2019;Mitrašević et al, 2020;Sanmartin et al, 2002). Past research has shown that UHN can arise from factors related to the healthcare system, including the availability and quality of services provided by healthcare facilities (Chung, 2022;Hwang, 2018;Marrone, 2007), as well as from population characteristics, such as socioeconomic and demographic status (Åhs et al, 2012;Allin et al, 2010;Bryant et al, 2009;Lee et al, 2015;Stevens & Gillam, 1998).…”