@misc{misc, title  = {{Issues, challenges and opportunities for economic evaluation of orphan drugs: an umbrella review protocol}},

 url = {{}},

 year = {{-0001}},

 month = {{11}},

 author = {{Grand T and Ren S and Thokala P and Åström DO and Regnier S and Hall J}},

 doi = {{10.15131/shef.data.23390060}},

 note = {{Accessed on 2026/06/13}}}