https://researchonline.lshtm.ac.uk/id/eprint/1604400/1/Roberts%20et%20al.%20-%202014%20-%20Killer-cell%20Immunoglobulin-like%20Receptor%20gene%20linkage%20and%20copy%20number%20variation%20analysis%20by%20droplet%20digital%20PCR.pdf