Ricardo Delgado Martin is specialized in biostatistics, clinical microbiology, clinical genetics and immunology.
This is a controversial study. There are scientists and medical doctors who disagree with the results of the Spanish study.
The evidence has to be ascertained and corroborated. What is required is that independent scientists and health professionals conduct their own lab analysis of the contents of the vaccine vial.
For further details on this project see the report by Prof. Dr. Pablo Campra Madrid, specialized in Chemistry and Biology, Escuela Superior de Ingenería, University of Almería.
See summary of their report entitled Graphene Oxide Detection in Aqueous Suspension, Observational study in Optical and Electron Microscopy.
The results of the Spanish study suggest, yet to be fully confirmed, that the recorded vaccine related deaths and “adverse events” (e.g. published in the US by the CDC and in the EU) are attributable to the presence of graphene oxide nano-particles contained in the Covid vaccine vial.