Epidemiological studies on problematic Internet use and problematic gaming conducted so
far have mainly been carried out with unrepresentative and self-selected convenience …

Why do we need to worry about sampling and survey design?.................. 2 The approach of
this volume........................................................................ 3 Overview of the content of this …

This paper explores whether the principles of horizontal and vertical equity in healthcare are
met by the Spanish national health system in the case of the Roma and general populations …

The rapid development of the sharing economy that has been registered in recent years is
caused by a number of factors. The increasingly pronounced effort on the part of all …

En este texto se muestran las estrategias y procedimientos para realizar una adecuada
recogida de información, explicando las tareas que realizan los entrevistadores o …

Background The postponement of parenthood may increase the number of couples
experiencing infertility and prolonged time to pregnancy. Previous research has revealed …

The study examines a model proposing relationships between personal values, positive (ie,
benefits) and negative (ie, threats) appraisal of immigrants, and social contact. Based on a …

Despite the rigorous investigation of the phenomenon of vaccine hesitancy and refusal
during the COVID-19 pandemic, the socioeconomic determinants of this phenomenon …

The sharing economy represents a phenomenon which is increasing in importance as time
goes by, even from the point of view of less developed countries. The aim of the study is to …

Although walking methodologies (WMs) and machine learning (ML) have been objects of
interest for urban scholars, it is difficult to find research that integrates both. We propose a …