SUPPLEMENTAL DIGITAL CONTENT 1 Table: High Impact Factor (>5) Non-neurosurgery Journals – Group 4 Cites / Doc. Journal Title SJR H index (2 years) Annual Review of Immunology 38.613 233 49.81 Immunity 17.915 277 20.97 Physiological Reviews 14.339 246 23.79 EMBO Journal 12.954 309 13.63 Journal of Cell Biology 12.189 293 13.33 Journal of Experimental Medicine 10.741 338 15.27 Advances in Cancer Research 9.544 72 10.91 MMWR. Recommendations and reports: Morbidity and mortality weekly report. Recommendations and reports / 9.055 99 15.38 Centers for Disease Control Endocrine Reviews 8.628 204 15.37 Advances in Immunology 8.498 78 11.69 Nature Medicine 7.978 395 14.33 Current Opinion in Immunology 7.822 151 12.22 Ca-A Cancer Journal for Clinicians 7.64 101 19.86 Reports on Progress in Physics 7.64 128 8.95 Archives of General Psychiatry 6.77 261 11.26 Biochimica et Biophysica Acta - Reviews on Cancer 6.733 99 5.67 Journal of Clinical Investigation 6.298 362 11.85 Trends in Immunology 5.85 171 11.74 Human Molecular Genetics 5.646 209 9.24 Circulation 5.449 460 9.48 Cytokine and Growth Factor Reviews 5.4 121 6.16 Clinical Microbiology Reviews 5.396 179 13.47 1 Cites / Doc. Journal Title SJR H index (2 years) Genome Research 5.393 205 7.13 Circulation Research 5.232 244 8.94 American Journal of Human Genetics 5.179 232 9.72 Brain Research Reviews 5.044 145 9.61 Seminars in Immunology 4.537 91 6.63 Immunological Reviews 4.459 157 6.08 Cancer Research 4.449 330 8.41 Annals of Internal Medicine 4.264 282 7.75 Annals of Neurology 4.225 213 8.59 Journal of the American College of Cardiology 4.134 300 6.18 Blood 3.999 334 7.94 Brain; a journal of neurology 3.949 227 7.72 Journal of Clinical Oncology 3.85 376 9.23 Critical Reviews in Neurobiology 3.81 54 8.19 Diabetes 3.78 244 6.53 Annual Review of Medicine 3.721 115 10.14 Reviews of Physiology Biochemistry and Pharmacology 3.68 56 5.11 American Journal of Psychiatry 3.678 254 6.49 Stroke 3.519 226 5.59 AIDS 3.487 173 8.09 Molecular Cancer Research 3.487 96 5.21 Schizophrenia Bulletin 3.479 123 5.72 Annals of Surgery 3.414 216 6.48 JAMA Internal Medicine 3.382 240 6.14 European Journal of Immunology 3.365 156 5.26 Gastroenterology 3.292 287 7.63 2 Cites / Doc. Journal Title SJR H index (2 years) Current Opinion in Microbiology 3.287 119 5.32 Human Brain Mapping 3.261 121 5.66 American Journal of Pathology 3.248 206 6.92 Annual Review of Nutrition 3.198 113 7.19 Journal of the National Cancer Institute 3.142 273 8.3 American Psychologist 3.058 152 5.8 Pharmacology and Therapeutics 3.034 137 6.66 FEMS Microbiology Reviews 3.033 130 6.71 American Journal of Respiratory and Critical Care 3 271 5.37 Medicine Arteriosclerosis, Thrombosis, and Vascular Biology 2.996 202 5.07 Trends in Microbiology 2.797 132 6.3 Hepatology 2.753 253 6.26 British Medical Journal 2.669 298 6.25 Journal of Cerebral Blood Flow and Metabolism 2.596 140 5.14 Journal of Infectious Diseases 2.505 188 5.41 Hypertension 2.477 198 5.18 Current Opinion in Lipidology 2.46 95 5.2 Journal of Neuropathology and Experimental Neurology 2.443 124 5.45 Journal of Bone and Mineral Research 2.36 180 5.26 Journal of Clinical Endocrinology and Metabolism 2.292 255 5.62 Neurology 2.289 262 5.15 Arthritis and Rheumatism 2.287 227 5.73 Prostate. Supplement, The 2.157 20 5.73 Molecular Psychiatry 2.011 144 5.82 Brain Pathology 1.998 98 5.17 3 Cites / Doc. Journal Title SJR H index (2 years) Journal of Clinical Psychopharmacology 1.947 98 5.38 American Journal of Clinical Nutrition 1.828 227 5.09 Seminars in Liver Disease 1.798 100 6.47 Medicine; analytical reviews of general medicine, 1.734 102 5.21 neurology, psychiatry, dermatology, and pediatries Cancer Chemotherapy and Pharmacology, Supplement 1.439 29 5.09 All non-neurosurgical medical journals with cites per doc (same as impact factor) of >5 were included in Group 4. The journals in this list are sorted by their SJR ranking. Neurosurgery articles published in these journals were identified via a PubMed search using the medical subject heading (MeSH) “neurosurgery” and setting the year of publication to 2000 (same as for G1, G2 and G3). 4 .