“…For the mixed methods synthesis: Those from ethnically diverse backgrounds in the USA may not receive the same level of pain relief from their treatment [ 83 , 84 , 90 , 92 ]. Black and Hispanic people in the USA may be less likely to receive adequate pain assessment [ 89 , 91 , 99 ]. Patients from all racial and ethnic groups had fears about side effects [ 88 , 89 , 96 , 102 , 106 , 108 , 128 , 129 , 131 ], but people from ethnically diverse groups in the USA and Australia were more likely to express fears of addiction or tolerance [ 89 , 96 , 102 , 106 , 108 , 131 ].…”