Cliff Lee is sidelined with a strained abdomen that could cause him to miss the first weeks of the season. The Mariners are using platelet-rich plasma injection therapy to treat their prized winter acquisition. The treatment has been used for the last decade mainly on joint issues such as tennis elbow, hamstring strains or other injuries to limbs. "It hasn't gotten to the point that it's accepted, standard practice," Mariners medical director Dr. Ed Khalfayan said of the therapy being used in the abdomen.