Study design setting, and participants
This study is a retrospective analysis of payment data publicly
disclosed by major pharmaceutical companies in Japan. The analysis
included all neurologists certified by the Japanese Society of Neurology
(JSN) as of February 2022. The JSN, established in 1960, is the
preeminent professional medical society for neurologists and is the sole
credentialing body for neurologists in Japan since 1967. As of the
specified date, 6107 neurologists were recognized as board-certified by
the JSN[50].