¹⁷⁷Lu-DOTATATE versus ¹⁷⁷Lu-EDTMP versus cocktail/sequential therapy in bone-confined painful metastatic disease in medullary carcinoma of the thyroid and neuroendocrine tumour: Can semiquantitative comparison of ⁶⁸Ga-DOTATATE and ¹⁸F-fluoride PET-CT aid in personalized treatment decision making in selecting the best therapeutic option?