By Ruth Chai and Ashley Tang SINGAPORE/KUALA LUMPUR, April 17 (Reuters) - Rubber glove makers have raised prices and warned of production cuts as the Iran war chokes supplies of key inputs, raising concerns for the healthcare sector. Glove makers have already hiked the average price of synthetic rubber gloves by around 40% to as high as $29 for a box of 1,000, according to Oong Chun Sung, an equity research analyst at CIMB Securities.