Importance Of PLT/MCH Ratio to Differentiate Isolated B12 Deficiency From B12 Deficiency Combined with Other Causes - Sheikh, Asma; Kumar, Suresh; Irshad, Zareen; Nusrat, Nadeem; Perveen, Salma; Razzak, Sadaf; Hasan, Syed (Annals of Jinnah Sindh Medical University, 2020)