[A mysterious question mark on the back].

@article{HkNikanne1999AMQ,
  title={[A mysterious question mark on the back].},
  author={Johanna H{\"o}{\"o}k-Nikanne and Arja Leena Kariniemi},
  journal={Duodecim; laaketieteellinen aikakauskirja},
  year={1999},
  volume={115 23},
  pages={2683, 2685}
}