pain neuropathic pain chronic pain neuropathy research genetics hiv hiv-associated sensory neuropathy epidemiology cannabis cannabinoids replication reproducible research statistics open science open data carrots exploratory data analysis data analysis purrr r statistical programming r treatment quality of life validity quantification utility multidimensional measurement unidimensional reliability scale analysis fraud collaboration phenomics phenotyping neuroppic phenome antidepressants analgesics analgesia opioids descending pain modulation stratification linkage disequilibrium population phenotype pruritic neuropathic nociceptor prurinergic itch pruritoceptor hiv-sn peter kamerman
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