NEFL and Alzheimer disease: Plasma NfL concentrations in studies on AD (Mattsson et al, 2017a, 2019; Weston et al, 2017; Lewczuk et al, 2018; Mielke et al, 2019; Preische et al, 2019; Benedet et al, 2020) have since been measured on the Simoa platform (HD‐1 Analyser, Quanterix) (Gisslen et al, 2016; Rohrer et al, 2016; Disanto et al, 2017; Thijssen et al, 2021a).