A method for performing a randomized double-blind medical clinical trial on a statistically significant number of participants using a constant amplitude electromagnetic system. The constant amplitude electromagnetic system comprises: a housing; at least one magnetic module contained within the housing, wherein each magnetic module includes: a ferromagnetic housing; including a non ferromagnetic segment forming an aperture; a wound magnetic wire coil on a perforated spindle having a coil diameter greater than a coil depth surrounding the aperture and located between the non-ferromagnetic segment and the ferromagnetic housing. The wound magnetic wire coil generates a constant amplitude electromagnetic magnetic field within the aperture when coupled to a direct electrical current.