NG conceptualised the study design and contributed in the development of the survey instruments.
DAN has contributed in the design and administration of the survey, the interpretation of the findings and the refinement of the manuscript.
ECN contributed in designing the study, developing the survey, supervising the data collection, analyzing the data, overseeing laboratory testing of soil samples, and drafting and writing of the manuscript.
MV obtained the DNA sequences, performed the population genetic analyses, participated in the phylogenetic survey and contributed in the writing of the paper.
AH and JM contributed in survey tools adaptation, trainings and supervised implementation of the data collection.
We are also grateful to NGOs from Sarajevo, Zenica and Banja Luka, Clinical Center of University in Sarajevo, Cantonal Hospital in Zenica, Clinical Centre in Banja Luka and many institutions that have indirectly contributed in survey such entity ministries (Federal Ministry of Health, RS Ministry of Health and Social Welfare), municipalities and police department.
In many countries, multilateral and bilateral agencies contributed to the survey.
AS contributed to the survey development.
PSN contributed with the survey data.
From another perspective, economic incentives may not be the only factor; noneconomic incentives may also encourage people to contribute to the survey, sometimes in combination with economic incentives.
