Binders and boxes store the large database of black lung cases and histories gathered by Dr. Brandon Crum at United Medical Group in Pikeville, Kentucky, U.S., May 22, 2018. Dr. Crum, a fourth generation coal miner whose family members still mine coal, is the radiologist who first noticed the massive number of x-rays of complicated black lung in the region and his black lung disease database tracks variables such as which vein miners worked, and the type of job they did. REUTERS/Brian Snyder SEARCH "BLACK LUNG" FOR THIS STORY. SEARCH "WIDER IMAGE" FOR ALL STORIES.