title: Response to letter from Khan et al.
authors.affiliation: Columbia University (ret.), USA. Electronic address: ejm1@caa.columbia.edu.
authors.forename: Ernest Joel
authors.initials: EJ
authors.lastname: Millman
authors.affiliation: Columbia University, USA.
authors.forename: Lewis
authors.initials: L
authors.lastname: Opler
mesh_terms: D003863:Depression / Q000453:epidemiology*; D004493:Education / Q000592:standards*; D005260:Female; D006801:Humans; D020407:Internet / Q000295:instrumentation*; D008297:Male; D013663:Teaching / Q000379:methods*; D013672:Technology
keywords: Measurement; Mental health; Psychiatric epidemiology; Surveys