1. A Twin Study of Cigarette and Snus Initiation and Quantity of Use in Norwegian Adult Twins. (22nd April 2019) Authors: Kendler, Kenneth S.; Aggen, Steven H.; Gillespie, Nathan; Czajkowski, Nikolai; Ystrom, Eivind; Reichborn-Kjennerud, Ted Journal: Twin research and human genetics Issue: Volume 22:Number 2(2019) Page Start: 108 Record Type: Journal Article View Content: Available online (eLD content is only available in our Reading Rooms) ↗
2. Associations between personality disorders and cannabis use and cannabis use disorder: a population‐based twin study. (13th April 2018) Authors: Gillespie, Nathan A.; Aggen, Steven H.; Neale, Michael C.; Knudsen, Gun Peggy; Krueger, Robert F.; South, Susan C.; Czajkowski, Nikolai; Nesvåg, Ragnar; Ystrom, Eivind; Kendler, Kenneth S.; Reichborn‐Kjennerud, Ted Journal: Addiction Issue: Volume 113:Number 8(2018) Page Start: 1488 Record Type: Journal Article View Content: Available online (eLD content is only available in our Reading Rooms) ↗
3. Cognitive improvement in first-episode schizophrenia and healthy controls: A 6-year multi-assessment follow-up study. (September 2018) Authors: Fu, Susie; Czajkowski, Nikolai; Torgalsbøen, Anne-Kari Journal: Psychiatry research Issue: Volume 267(2018) Page Start: 319 Record Type: Journal Article View Content: Available online (eLD content is only available in our Reading Rooms) ↗
4. Cognitive, Work and Social Outcomes in Fully Recovered First-Episode Schizophrenia: On and Off Antipsychotic Medication. Issue 1 (2nd January 2019) Authors: Fu, Susie; Czajkowski, Nikolai; Torgalsbøen, Anne-Kari Journal: Psychiatry Issue: Volume 82:Issue 1(2019) Page Start: 42 Record Type: Journal Article View Content: Available online (eLD content is only available in our Reading Rooms) ↗
5. Does low alcohol use increase the risk of sickness absence? A discordant twin study. (December 2016) Authors: Østby, Kristian; Czajkowski, Nikolai; Knudsen, Gun; Ystrøm, Eivind; Gjerde, Line; Kendler, Kenneth; Ørstavik, Ragnhild; Reichborn-Kjennerud, Ted Journal: BMC public health Issue: Volume 16:Number 1(2016) Page Start: 1 Record Type: Journal Article View Content: Available online (eLD content is only available in our Reading Rooms) ↗
6. Explaining the association between anxiety disorders and alcohol use disorder: A twin study. Issue 6 (5th March 2019) Authors: Torvik, Fartein Ask; Rosenström, Tom Henrik; Gustavson, Kristin; Ystrom, Eivind; Kendler, Kenneth S.; Bramness, Jørgen G.; Czajkowski, Nikolai; Reichborn‐Kjennerud, Ted Journal: Depression and anxiety Issue: Volume 36:Issue 6(2019) Page Start: 522 Record Type: Journal Article View Content: Available online (eLD content is only available in our Reading Rooms) ↗
7. F80. COGNITIVE TRAJECTORIES OVER 6 YEARS IN FIRST-EPISODE SCHIZOPHRENIA AND HEALTHY CONTROLS – A PROSPECTIVE LONGITUDINAL MULTI-ASSESSMENT STUDY. (1st April 2018) Authors: Fu, Susie; Czajkowski, Nikolai; Torgalsboen, Anne-Kari Journal: Schizophrenia bulletin Issue: Volume 44(2018)Supplement 1 Page Start: S250 Record Type: Journal Article View Content: Available online (eLD content is only available in our Reading Rooms) ↗
8. Genetic and Environmental Contributions to Long-Term Sick Leave and Disability Pension: A Population-Based Study of Young Adult Norwegian Twins. (7th June 2013) Authors: Gjerde, Line C.; Knudsen, Gun Peggy; Czajkowski, Nikolai; Gillespie, Nathan; Aggen, Steven H.; Røysamb, Espen; Reichborn-Kjennerud, Ted; Tambs, Kristian; Kendler, Kenneth S.; Ørstavik, Ragnhild E. Journal: Twin research and human genetics Issue: Volume 16:Number 4(2013) Page Start: 759 Record Type: Journal Article View Content: Available online (eLD content is only available in our Reading Rooms) ↗
9. Ludvig Dahl's psychiatric genetic studies in his 1859 monograph: "Contribution to the knowledge of insanity in Norway". Issue 6 (24th July 2022) Authors: Kendler, Kenneth S.; Czajkowski, Nikolai; Reichborn‐Kjennerud, Ted Journal: American journal of medical genetics Issue: Volume 189:Issue 6(2022) Page Start: 177 Record Type: Journal Article View Content: Available online (eLD content is only available in our Reading Rooms) ↗
10. Maternal alcohol use during pregnancy and offspring attention-deficit hyperactivity disorder (ADHD): a prospective sibling control study. (24th April 2017) Authors: Eilertsen, Espen Moen; Gjerde, Line C; Reichborn-Kjennerud, Ted; Ørstavik, Ragnhild E; Knudsen, Gun Peggy; Stoltenberg, Camilla; Czajkowski, Nikolai; Røysamb, Espen; Kendler, Kenneth S; Ystrom, Eivind Journal: International journal of epidemiology Issue: Volume 46:Number 5(2017) Page Start: 1633 Record Type: Journal Article View Content: Available online (eLD content is only available in our Reading Rooms) ↗