CHCHD2 and Parkinson disease: Diverse genetic causes of PD, including PINK1, parkin, DJ‐1, CHCHD2, α‐synuclein, and LRRK2 mutations,3, 4 impair energy metabolism, and the mitochondrial toxins 1‐methyl‐4‐phenyl‐1,2,3,6‐tetrahydropyridine and rotenone induce PD.2