The PRIPS study: screening battery for subjects at risk for Parkinson's disease. - Berg, D.; Godau, J.; Seppi, K.; Behnke, S.; Liepelt‐Scarfone, I.; Lerche, S.; Stockner, H.; Gaenslen, A.; Mahlknecht, P.; Huber, H.; Srulijes, K.; Klenk, J.; et al. (European Journal of Neurology, 2013)