The authors regret to announce a small mistake occurred in their paper by Wang et al. (1) which may confuse the reader.
Frailty is a major health problem in older people and, as the population ages, identification of its underlying biological mechanisms will be increasingly important. DNA methylation patterns within genomic DNA change during ageing and alterations in DNA methylation, particularly at gene promoter regions, can lead to altered gene expression. However the… (More)