Multi-criteria decision making to validate performance of RBC-based formulae to screen $$\beta$$ β -thalassemia trait in heterogeneous haemoglobinopathies oleh Atul Kumar Jain, Prashant Sharma, Sarkaft Saleh, Tuphan Kanti Dolai, Subhas Chandra Saha, Rashmi Bagga, Alka Rani Khadwal, Amita Trehan, Izabela Nielsen, Anilava Kaviraj, Reena Das, Subrata Saha