Helinä Hakko

Vitamin D supplementation during the first year of life and risk of schizophrenia: a Finnish birth cohort study

John J. McGrath, K. Matti Saari, Helinä Hakko et al. · Schizophrenia Research · 2003 · 291 citations

Medicine, Nutrition, Psychiatry +14

A comparison of clinical and research DSM-III-R diagnoses of schizophrenia in a Finnish national birth cohort

Matti Isohanni, T. M�kikyr�, J. Moring et al. · Social Psychiatry and Psychiatric Epidemiology · 1997 · 279 citations

Medicine, Psychiatry, Psychiatric Assessment +6

Seasonal Variation in the Occurrence of Homicide in Finland

Jari Tiihonen, Pirkko Räsänen, Helinä Hakko · American Journal of Psychiatry · 1997 · 223 citations

Law, Psychiatry, Homicide +14

Maternal Smoking During Pregnancy and Risk of Criminal Behavior Among Adult Male Offspring in the Northern Finland 1966 Birth Cohort

Pirkko Räsänen, Helinä Hakko, Matti Isohanni et al. · American Journal of Psychiatry · 1999 · 213 citations

Public Health, Maternal Health, Obstetrics +15

The association of preceding traumatic brain injury with mental disorders, alcoholism and criminality: the Northern Finland 1966 Birth Cohort Study

Markku Timonen, Jouko Miettunen, Helinä Hakko et al. · Psychiatry Research · 2002 · 165 citations

Medicine, Neurology, Psychiatry +12