In this cohort there was no case of squamous cell cancer of the skin (0.51 expected); however, there were some cases of basal cell carcinoma not reported here as they are not regularly registered in the Cancer Registry and so the information on basal cell carcinoma is thus not considered to be reliable. In the first Canadian study there was an excess of non-melanoma skin cancer when squamous cell cancer and basal cell carcinoma were grouped together