What is the impact of prolonged electromagnetic exposure on human health?
Actually the applications of magnetism to organic systems is new to Science.  Duke Univ in NC is currently experimenting with humans sticking their heads into large electromagnetic coils while electrodes are attached to the outside of the skull. A small amount of research has been done with magnetism and plant physiology (my interest), but in the main very little published research is available on the topic.  I might direct you to use Scholar.Google to find more technical articles rather than just using Google itself.