On 2016 Dec 20, Huang Nan commented:

This paper introduced a very peculiar observation, which states that 18% and 42% of rural and urban Beijing female, with avaerge age in the early 60s, are sunbed users (Table 1). This is highly counter-intuitive as there would be less than 1% sunbed user exists in any Chinese population. Despite this observation, the authors claimed in the text that: "Only a few individuals had a sunburn history or used sunbeds."

On 2016 Dec 20, Huang Nan commented:

This paper introduced a very peculiar observation, which states that 18% and 42% of rural and urban Beijing female, with avaerge age in the early 60s, are sunbed users (Table 1). This is highly counter-intuitive as there would be less than 1% sunbed user exists in any Chinese population. Despite this observation, the authors claimed in the text that: "Only a few individuals had a sunburn history or used sunbeds."