Question: There is considerable controversy among scientists about the potential carcinogenic effects of magnetic fields. Several epidemiology studies have suggested a possible link between electromagnetic fields (EMFs) and a variety of human ailments. How would studies be designed to determine if EMFs are associated with cancers
(a) in human tissues and
(b) in live humans?
What confounding variables can be controlled
(c) in the designs and
(d) in the analyses?