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First Online: 11 May 2020

Compliance with Ethical Standards

:

: The authors declare that they have no conflicts of interest.

: Due to the lack of an institutional ethics committee, such an approval is not available. However, a letter of authorization is presented by the Faculty of Biology, Autonomous University of Sinaloa, indicating the assessment and correct application of the protocols and methodologies presented in the study, asserting that the study does not imply any risk to the health of participants. Likewise, no personal data (such as names, ages or other information of a private nature) of the participants were collected and/or disclosed.

: The sampling of mobile phone screens was performed with the consent of each person invited to participate. Informed consent is attached in a separate file.

: All authors have read and approved the final manuscript to be published.

: All the sequences of the 16S rRNA V4 and V6 gene regions are available in the NCBI GenBank database.

: The software used in the presentation can be found on the Internet free of charge.