AUTHOR CONTRIBUTIONS
Jukka Vanhanen, Hanna Harno, and Eija Kalso conceived the study. Hanna Harno recruited the patients, Jukka Vanhanen and Hanna Harno collected the data. Jukka Vanhanen, Jan Kujala, Mia Liljeström, and Jussi Virkkala analyzed the data. Jukka Vanhanen drafted the manuscript. All authors participated in data interpretation, revised the article critically, and approved the final version of the article.