Which value set(s) should I apply in case of an international study?

If you need to obtain health state utility values for the EQ-5D-5L, the recommendation is to use the United States EQ-5D-5L value set from Pickard et al. (2019) as the United Kingdom valuation study is currently ongoing. If you need to obtain health state utility values for the EQ-5D-3L, it is recommended to use the United Kingdom value set from Dolan et al. (2002).