January 19, 2015 article Open access Control Outcomes and Exposures for Improving Internal Validity of Nonrandomized Studies Health Services Research DOI: 10.1111/1475-6773.12279 Full text (OA) OpenAlex Authors 0 Author list not loaded yet. Cited by 1 stored of 72 Search Sort Most cited Newest Oldest Patent citations Title Any typearticle review book-chapter conference-paper preprint dissertation book dataset other Any fieldAgricultural and Biological Sciences Arts and Humanities Biochemistry, Genetics and Molecular Biology Business, Management and Accounting Chemical Engineering Chemistry Computer Science Decision Sciences Dentistry Earth and Planetary Sciences Economics, Econometrics and Finance Energy Engineering Environmental Science Health Professions Immunology and Microbiology Materials Science Mathematics Medicine Neuroscience Nursing Pharmacology, Toxicology and Pharmaceutics Physics and Astronomy Psychology Social Sciences Veterinary Open access Negative controls: Concepts and caveats 2023 Statistical Methods in Medical Research article Mathematics Advanced Causal Inference Techniques Open access 11 citations 1 result References 0