Department of Orthopaedic Surgery, Duke University School of Medicine, and Duke-Margolis Center for Health Policy, Duke University, Durham, North Carolina.; Providence VA Medical Center; Department of Health Services, Policy and Practice, School of Public Health, Brown University; and Center for Gerontology and Health Care Research, Box G-S121 (6), 121 S. Main Street, Providence, Rhode Island 02912 (USA).

[Unwin, H. Juliette T.; Mishra, Swapnil; Mellan, Thomas A.; Coupland, Helen; Vollmer, Michaela A. C.; Whittaker, Charles; Hawryluk, Iwona; Milton, Philip; Ainslie, Kylie E. C.; Baguelin, Marc; Brazeau, Nick F.; Cattarino, Lorenzo; Cucunuba, Zulma; Cuomo-Dannenburg, Gina; Dorigatti, Ilaria; Eales, Oliver D.; van Elsland, Sabine L.; FitzJohn, Richard G.; Gaythorpe, Katy A. M.; Green, William; Hinsley, Wes; Jeffrey, Benjamin; Knock, Edward; Laydon, Daniel J.; Lees, John; Nedjati-Gilani, Gemma; Nouvellet, Pierre; Okell, Lucy; Parag, Kris, V; Siveroni, Igor; Thompson, Hayley A.; Walker, Patrick; Walters, Caroline E.; Watson, Oliver J.; Whittles, Lilith K.; Ghani, Azra C.; Ferguson, Neil M.; Riley, Steven; Donnelly, Christl A.; Bhatt, Samir] Imperial Coll, Abdul Latif Jameel Inst Dis & Emergency Analyt J, MRC Ctr Global Infect Dis Anal, London, England; [Bradley, Valerie C.; Hutchinson, Michael; Donnelly, Christl A.] Univ Oxford, Dept Stat, Oxford, England; [Gandy, Axel; Ish-Horowicz, Jonathan; Filippi, Sarah L.; Xi, Xiaoyue; Monod, Melodie; Ratmann, Oliver; Zhu, Harrison; Flaxman, Seth] Imperial Coll, Dept Math, London, England; [Baguelin, Marc] London Sch Hyg & Trop Med, Dept Infect Dis Epidemiol, London, England; [Boonyasiri, Adhiratha] Imperial Coll London, NIHR Hlth Protect Res Unit Healthcare Associated, London, England; [Eaton, Jeffrey W.] Imperial Coll, MRC Ctr Global Infect Dis Anal, London, England; [Nouvellet, Pierre] Univ Sussex, Sch Life Sci, Brighton, E Sussex, England; [Watson, Oliver J.] Brown Univ, Dept Lab Med & Pathol, Providence, RI 02912 USA

Department of Otolaryngology, Massachusetts Eye and Ear, Harvard Medical School, Boston, Massachusetts.

Sociology Department, University of Trento, Trento, Italy.; IARD Institute, Milan, Italy.; Adolescence Lab Association, Pavia, Italy.; Cystic Fibrosis Unit, Istituto G. Gaslini, Genoa, Italy.; Department of Paediatrics, Fondazione IRCCS Policlinico San Matteo, University of Pavia, Pavia, Italy.; Allergy Clinic, Casa di Cura Villa Montallegro, Via P. Boselli 5, 16146, Genoa, Italy. gio.cip@libero.it.

Department of Hematology and Oncology, National University Cancer Institute.; Yong Loo Lin School of Medicine, National University of Singapore.; Department of Medicine, National University Hospital.; Department of Cardiology, National University Heart Centre Singapore.; Division of Neurology, Department of Medicine, National University Hospital, Singapore, Singapore.

Department of Economics and School of Global Environmental Sustainability, Colorado State University, Fort Collins, CO 80523, USA.; Department of Economics and School of Global Sustainability, Colorado State University, Fort Collins, CO 80523, USA.

[Perrotta, Fabio] Univ Molise, Dept Med & Hlth Sci V Tiberio, Campobasso, Italy; [Matera, Maria Gabriella] Univ Campania Luigi Vanvitelli, Dept Expt Med, Naples, Italy; [Cazzola, Mario] Univ Roma Tor Vergata, Dept Expt Med, Via Montpellier 1, I-00133 Rome, Italy; [Bianco, Andrea] Univ Campania L Vanvitelli, Hosp Monaldi, Dept Translat Med Sci, Via L Bianchi, I-80131 Naples, Italy

Department of Radiology, University of Washington School of Medicine, Seattle, Washington. Electronic address: mmossab@uw.edu.; Department of Radiology, University of Washington School of Medicine, Seattle, Washington.