PRKN and Parkinson disease: Although Lee et al. screened 68 probands in Taiwan with early‐onset parkinsonism for mutations in the PARKIN, DJ‐1, and PINK1 genes and identified nine patients who harbored mutations in PARK2, including heterozygous duplication of exon 6 (Lee et al., 2009), the present study is the first to identify a heterozygous duplication of exon 6 in the population of the Chinese mainland.