Discuss the qualitative design methodology used by the researcher(s) in the following article: "Persistent symptoms after Covid-19: qualitative study of 114 'long Covid' patients and draft quality principles for services." DOI:10.1186/s12913-020-06001-y. Discuss the sampling method and the data collection methods. Discuss the results of the study. Based on the study's results, what were the recommendations given by the researcher(s)? How could the results be used to support a change in practice?