Affiliation: | 1. Merck & Co., Inc, Merck Research Laboratories, , Kenilworth, NJ, 07033 USA;2. Merck & Co., Inc, Merck Research Laboratories, , West Point, PA, 19486‐0004 USA;3. Waters Corporation, , Milford, MA, 01757 USA;4. Waters Corporation, , Manchester, M23 9LZ UK;5. Beryllium, , 3 Preston Court Bedford, MA 01730 USA |