“…Eleven studies applied non-validated subscales, often incorporated within self-designed instruments and mainly measuring objective financial burden (e.g., OOP costs). Psychosocial responses were relatively more integrated in non-validated subscales, either complementary [ 38 , 50 ] or substitutive [ 46 , 54 , 55 , 56 , 57 , 58 ] to material components. Behavioural aspects were less often considered, except for [ 7 , 38 , 50 , 59 ].…”