Stimulation of one or more neurons of the sympathetic nervous system, including the splenic nerve, to attenuate an immune response, including an inflammatory immune response, is discussed. The seal is at least partially disposed in the groove. Tactile and visual indicators allow a user to ensure that the belt is optimally installed even in conditions in which the user may not view such indicators. The test results are computed by various software computation modules configured to independently execute in parallel with the subsequent tests.