title: Letter to the editor.
authors.affiliation: Department of Medical Epidemiology and Biostatistics, Karolinska Institutet, Stockholm, Sweden.
authors.forename: Annika
authors.initials: A
authors.lastname: Linde
authors.affiliation: Department of Medical Epidemiology and Biostatistics, Karolinska Institutet, Stockholm, Sweden.
authors.forename: Amelie
authors.initials: A
authors.lastname: Plymoth