(1) Whether he has commissioned any research into the effects of radiation from cellphone base stations and masts; if not, why not; if so, what are the relevant details; (2) whether there are any concerns about the health risks emanating from such radiation; if not, how was this conclusion reached; if so, what are the relevant details; (3) whether his department has provided any guidance to authorities for adjudicating applications to erect these structures; if not, why not; if so, what are the relevant details; (4) whether there is any minimum buffer zone that must be observed before applications for the erection of these structures in residential areas are approved; if not, why not; if so, what are the relevant details?