Test-retest repeatability of questionnaire for pain symptoms for school children aged 10–15 years - Pirnes, Katariina; Kallio, Jouni; Siekkinen, Kirsti; Hakonen, Harto; Häkkinen, Arja; Tammelin, Tuija (Walter de Gruyter GmbH; Scandinavian Association for the Study of Pain, 2019)