Searching for the optimal measuring frequency in longitudinal studies -- an example utilizing short message service (SMS) to collect repeated measures among patients with low back pain
Crossref DOI link: https://doi.org/10.1186/s12874-016-0221-4
Published Online: 2016-09-13
Published Print: 2016-12
Update policy: https://doi.org/10.1007/springer_crossmark_policy
Axén, Iben
Bodin, Lennart
License valid from 2016-09-13
