Erratum to: Health Inf Sci Syst (2015) 3:4 DOI 10.1186/s13755-015-0012-z

After the publication of this work [1], we noticed an error whereby Figure 7 had five charts representing data from different subject areas which are identical. The corrected Fig. 7 is given below:

Fig. 7
figure 7

Fluctuations. Fluctuations in the frequency band by the ratio during continuous operation