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Lakshman, A., Nampoothiri, R.V., Sreedharanunni, S. et al. Knuckle Pigmentation: A Clue to Systemic Illness. Indian J Hematol Blood Transfus 32, 507–508 (2016). https://doi.org/10.1007/s12288-016-0690-y
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DOI: https://doi.org/10.1007/s12288-016-0690-y