Standardized Protocol Items Recommendations for Observational Studies (SPIROS) for Observational Study Protocol Reporting Guidelines: Protocol for a Delphi Study

Raman Mahajan   ^{1, 2 *} , MSci, MPH ;   Sakib Burza   ^{2 *} , MBChB, MSc, PhD, MRCGP ;   Lex M Bouter   ^{3, 4 *} , PhD ;   Klaas Sijtsma   ^{5 *} , PhD ;   André Knottnerus   ^{1 *} , PhD ;   Jos Kleijnen   ^{1 *} , MD, PhD ;   Peter Van Dael   ^{6 *} , PhD ;   Maurice P Zeegers   ^{1, 7 *} , PhD

¹ Care and Public Health Research Institute, Maastricht University, Maastricht, NL

² Médecins Sans Frontières, New Delhi, IN

³ Department of Epidemiology and Data Science, Amsterdam University Medical Centers, Amsterdam, NL

⁴ Department of Philosophy, Vrije Universiteit, Amsterdam, NL

⁵ Department of Methodology and Statistics, Tilburg School of Social and Behavioral Sciences, Tilburg University, Tilburg, NL

⁶ DSM Nutritional Products, Basel, CH

⁷ School for Nutrition and Translational Research in Metabolism, Maastricht University, Maastricht, NL

*all authors contributed equally