Variable day/night bias in 24-h non-invasive finger pressure against intrabrachial artery pressure is removed by waveform filtering and level correction. - Westerhof,BE.; Guelen,I.; Parati,G.; Groppelli,A.; Montfrans,GA van.; Wieling,W.; Wesseling,KH.; Bos,WJ. (J Hypertension, 2002)