# Progress in the Knowledge, Application and Influence of Extremely Low Frequency Signals
## 3 Results and Discussion
### Author Analysis, Affiliations, and Countries of Investigation in ELF
\begin{table}
\begin{tabular}{c c c c c c c} \hline \hline
**Indexed Name** & **H-Index** & **Citation\_Count** & **Document\_Count** & **University (County)** & **First Publication (Year)** & **Community** \\ \hline [PERSON]. & 150 & 93,111 & 1530 & University of Texas Health Science Center at San Antonio & 2005 & ELF in health \\  & & & & (United States) & 2005 & ELF in health \\ \hline [PERSON]. & 139 & 64,092 & 768 & Harvard Medical School (United States) & 2005 & ELF in health \\ \hline [PERSON]. & 136 & 138,460 & 917 & Institut fur Sozial- und Praventivmedizin (Switzerland) & 2009 & ELF in health \\ \hline [PERSON]. & 130 & 70,964 & 1101 & Karolinska University Hospital (Sweden) & 2010 & ELF in health \\ \hline [PERSON]. & 123 & 63,930 & 1212 & Icahn School of Medicine at Mount Sinai (United States) & 2005 & ELF in health \\ \hline [PERSON]. & 119 & 56,983 & 552 & Imperial College London (United Kingdom) & 2009 & ELF in health \\ \hline [PERSON]. & 109 & 51,329 & 739 & Karolinska Institut (Sweden) & 2005 & ELF in health \\ \hline [PERSON]. & 105 & 50,474 & 1081 & Melbourne School of Population and Global Health (Australia) & 2017 & ELF in health \\ \hline [PERSON]. & 104 & 42,346 & 526 & University of California (United States) & 2005 & ELF in health \\ \hline [PERSON]. & 102 & 49,768 & 964 & Azienda Oppedalica Cvike M.P. Anezzo (Italy) & 2005 & ELF in health \\ \hline [PERSON]. & 101 & 28,827 & 686 & University College Dublin (Ireland) & 2005 & ELF in health \\ \hline [PERSON]. & 99 & 43,732 & 889 & Istitutoelle Scienze Neurologiche di Bologna (Italy) & 2014 & ELF in health \\ \hline [PERSON]. & 99 & 53,805 & 802 & \begin{tabular}{c} iSS-Instituto de Investigagio e Inovacao en Suide, \\ Universidade do Porto (Portugal) \\ \end{tabular} & 2017 & ELF in health \\ \hline [PERSON]. & 98 & 41,191 & 269 & UCL (United Kingdom) & 2005 & ELF in health \\ \hline [PERSON]. & 97 & 40,078 & 731 & Finnish Cancer Registry (Finland) & 2005 & ELF in health \\ \hline [PERSON]. & 97 & 50,687 & 1071 & High Energy Accelerator Research Organization (Japan) & 2012 & \
\begin{tabular}{c} Lightning ELF \\ phenomena \\ \end{tabular} \\ \hline [PERSON]. & 96 & 47,019 & 898 & University of California (United States) & 2007 &
\begin{tabular}{c} Lightning ELF \\ phenomena \\ \end{tabular} \\ \hline [PERSON]. & 95 & 33,301 & 302 & Universidade gli Studi di Padova (Italy) & 2005 & ELF in health \\ \hline [PERSON]. & 95 & 35,519 & 471 & University of Toronto (Canada) & 2010 & ELF in health \\ \hline [PERSON]. & 94 & 35,660 & 472 & Masstrich University (Netherlands) & 2005 & ELF in health \\ \hline \hline \end{tabular}
\end{table} 
Table 1: Top 20 most-important authors by H-Index. If we relate the H-index values of the authors with the communities in which they investigate, it is observed that in the list of the top-20 only 2 communities participate, which coincide with the larger communities. Ninety percent of the authors publish in the largest community, the ELF in health community, which shows great interest between the relationship between the effects of ELF fields and health. Most of the authors of this table began to publish in this subject in 2005 and only two of these authors began their publications in 2017, although this does not imply that it is the first publication of these authors, as they may have previously investigated in other fields.