(1) Whether, with reference to his reply to question 317 on 9 March 2011, any sign boards were erected on site notifying the residents of the installation of the sub-station; if not, why not; if so, on which date were these sign boards erected; (2) whether his department intends to conduct a study into the potential detrimental health effects of the magnetic fields; if not, what assurances will his department give to the residents that there will be no detrimental health effects; if so, (a) when will the study be conducted and (b) who will conduct the study; (3) whether he has been informed of any research that indicates that magnetic fields can cause cancer; if so, (4) whether he has found that any groups of persons such as (a) children and (b) pregnant women are more vulnerable than others; if so, which groups?