With the arrival of effective COVID-19 vaccines, the main issue in the fight against the pandemic became how to quickly vaccinate as many people as possible to contain the pandemic and especially to protect those most at risk, e.g. the older population. After initial problems with vaccine supply...

English Abstract: The first wave of the COVID-19 pandemic hit the European countries at the beginning of 2020. This has become particularly problematic for those in need for personal care as related epidemiological control measures (physical distancing, stay-at-home requirements etc.) installed...

English Abstract: Longitudinal surveys aim to correctly represent the population of interest over time. In this respect, panel attrition, i.e. the systematic drop-out of sample members, is a major challenge for maintaining long-running panel surveys. A second problem might arise when some sample...