The term 'MECR cases' is ambiguous and could refer to two distinct topics. It might relate to MECR-related neurologic disorder, a progressive childhood-onset condition affecting movement and vision, diagnosed through genetic testing. Alternatively, MECR could stand for Multilateral Export Control Regimes, voluntary agreements by major supplier countries to regulate the transfer of sensitive military and dual-use technologies to prevent proliferation. Further clarification is needed to provide a specific answer.