Methodological Challenges When Comparing Demographic and Clinical Characteristics of International Observational Registries

Suzanne M.M. Verstappen, Johan Askling, Niklas Berglind, Stefan Franzen, Thomas Frisell, Christopher Garwood, Jeffrey D. Greenberg, Marie Holmqvist, Laura Horne, Kathy Lampl, Kaleb Michaud, Fredrik Nyberg, Dimitrios A. Pappas, George Reed, Deborah P.M. Symmons, Eiichi Tanaka, Trung N. Tran, Hisashi Yamanaka, Meilien Ho