Niels Okkels

Brain-first versus body-first Parkinson’s disease: a multimodal imaging case-control study

Jacob Horsager, Katrine B. Andersen, Karoline Knudsen et al. · Brain · 2020 · 705 citations

Sleep Disorders, Cardiac Sympathetic Innervation, Clinical Neurology +25

Depression and the risk of severe infections: prospective analyses on a nationwide representative sample

Niklas Worm Andersson, Renée D. Goodwin, Niels Okkels et al. · International Journal of Epidemiology · 2015 · 144 citations · Full text

Depression and the risk of autoimmune disease: a nationally representative, prospective longitudinal study

Niklas Worm Andersson, Lea Nørgreen Gustafsson, Niels Okkels et al. · Psychological Medicine · 2015 · 99 citations

Changes in the diagnosed incidence of early onset schizophrenia over four decades

Niels Okkels, Ditte Lammers Vernal, S. O. W. Jensen et al. · Acta Psychiatrica Scandinavica · 2012 · 68 citations · Full text

Traumatic Stress Disorders and Risk of Subsequent Schizophrenia Spectrum Disorder or Bipolar Disorder: A Nationwide Cohort Study

Niels Okkels, Betina B. Trabjerg, Mikkel Arendt et al. · Schizophrenia Bulletin · 2016 · 56 citations · Full text