SYSTEMATIC BIAS:
A term that is sometimes used to refer to Bias in medical research studies (synonym)1; which is a systematic deviation of observations, results, inferences, or conclusions from the truth.
The term Systematic Bias is sometimes used by scientists, presumably to draw a clear distinction in their argument between random or statistical errors (which occur due to small samples), and Bias (false conclusions due to problems in study design or research conduct, aside from small samples). The term Bias is sometimes used by statisticians to refer to a deviation of estimates from the truth, whereas epidemiologists or other researchers may use the term Bias to refer to systematic deviations from the truth; hence the use of the term Systematic Bias in some contexts. Also see: Bias (Definition), and Research Bias.
Reference:
1. Malone H, Nicholl H, Tracey C. Awareness and minimisation of systematic bias in research. British journal of nursing (Mark Allen Publishing). 2014;23(5):279-82. (Link to Reference)