Pew Research Center’s cross-national studies are fielded in a range of polling environments, from countries where telephone surveys are regularly administered to nations where face-to-face surveys are ...

Pew Research Center designed this study to assess the current state of online survey sampling methods – both probability-based and opt-in – and determine their accuracy on general population estimates ...

A French quality of life questionnaire specific to erectile dysfunction (ED), ‘QVS’ for ‘Questionnaire de Vie Sexuelle’, has been developed. This paper describes its validation: item reduction and ...

In recent decades, the preparation of samples for transmission electron microscopes has transformed, thanks to the introduction of focused ion beam (FIB) instruments. Known as either single-beam or ...