While the greatest burden of disease is borne by low-and middle- income countries, these research areas may not be the focus of (or contributions) to systematic reviews, which are regarded as the highest levels of evidence.
Articles that support this problem:
Evaluation of intervention systematic reviews on chronic non-communicable diseases and lifestyle risk factors in low-middle income countries: meta-research
2025 : Bmc medical research methodology
Interventions that address interpersonal violence experienced by adolescents globally: a systematic review of reviews
2024 : Injury prevention