%0 Journal Article %T Challenges in the Analysis of Longitudinal Pain Data: Practical Lessons from a Randomized Trial of Annular Closure in Lumbar Disc Surgery %A Charlotte Fl¨¹h %A Gerrit J. Bouma %A Larry E. Miller %A Martin Barth %A Richard Bostelmann %A Sandro Eustacchio %A Senol Jadik %J Archive of "Pain Research and Treatment". %D 2019 %R 10.1155/2019/3498603 %U https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6378008/