Levi R. Kvitland

Indications of a dose–response relationship between cannabis use and age at onset in bipolar disorder

Trine Vik Lagerberg, Levi R. Kvitland, Sofie R. Aminoff et al. · Psychiatry Research · 2013 · 52 citations

Medicine, Pharmacology, Psychiatry +11

Low vitamin D is associated with negative and depressive symptoms in psychotic disorders

Mari Nerhus, Akiah Ottesen Berg, Levi R. Kvitland et al. · Schizophrenia Research · 2016 · 38 citations · Full text

Medicine, Psychiatry, Neuropsychiatry +14

Migrant background and ethnic minority status as predictors for duration of untreated psychosis

Mari Nerhus, Akiah Ottesen Berg, Marit Haram et al. · Early Intervention in Psychiatry · 2013 · 33 citations · Full text

Medicine, Psychiatry, Psychology +14

Cannabis use in first‐treatment bipolar I disorder: relations to clinical characteristics

Levi R. Kvitland, Ingrid Melle, Sofie R. Aminoff et al. · Early Intervention in Psychiatry · 2014 · 30 citations

Medicine, Psychiatry, Psychology +13

Neurocognitive functioning, clinical course and functional outcome in first‐treatment bipolar I disorder patients with and without clinical relapse: A 1‐year follow‐up study

Christine Demmo, Trine Vik Lagerberg, Levi R. Kvitland et al. · Bipolar Disorders · 2017 · 29 citations

Medicine, Psychiatry, Psychology +17