by Katherine Griffin Kelsey Minarik turned a scary blood clot into a business opportunity. Eight years ago, Minarik was flying cross-country to celebrate her 21st birthday in New York when one of her legs swelled up. It was a deep vein thrombosis, a type of blood clot that can be fatal if it travels to the lungs. Fortunately, that didn’t happen to Minarik. But to guard against another clot forming, her doctors advised her to wear compression stockings, which help…