What is the fine-grained topic of the following text: In the period covering October 2011 up to and including February 2012, that fieldwork was carried out in a similar fashion in 17 European countries, namely Ireland, the UK, Denmark, Sweden, Germany, Belgium, Luxembourg, Cyprus, Spain, Portugal, Poland, the Czech Republic, Slovakia, Switzerland, Romania, Slovenia and Hungary. Only return the topic.
Fieldwork conducted in 17 European countries from October 2011 to February 2012