title: Re: Negative Control Outcomes and the Analysis of Standardized Mortality Ratios.
authors.affiliation: Institute for Medical Biometry and Epidemiology, University Medical Center Hamburg-Eppendorf, Hamburg, Germany, j.hengelbrock@uke.de.
authors.forename: Johannes
authors.initials: J
authors.lastname: Hengelbrock
authors.forename: Heiko
authors.initials: H
authors.lastname: Becher