One study (Visser et al, 2012) crosses regions (one point in the UK region and two in Scandinavia/North Atlantic region) so total number of new studies exceeds actual total (n=53). Also, note that another study (Ha-Vinh, 2016) crosses regions, including 22 in the Atlantic Coast/Central Europe region, 3 in South America and 1 in the Middle East/Africa region.

Australasia (including Australia and New Zealand); UK region (including the United Kingdom of Great Britain and Northern Ireland (England, Northern Ireland, Scotland and Wales), Ireland, and the Orkney Islands (UK)); Scandinavia and North Atlantic (including Denmark, Finland, Iceland, Norway, Sweden, the Faroe Islands (Denmark), and the Shetland Islands (UK)); Atlantic and Central Europe (including Austria, Belgium, the Czech Republic, France, Germany (as well as the countries formerly known as East Germany and West Germany), the Netherlands, Portugal, Spain (continental, the Balearic Islands and the Canary Islands), and Switzerland); the Italian region (including Peninsular and Insular Italy, and San Marino); Eastern Europe (including Albania, Bosnia-Herzegovina, Bulgaria, Croatia, Estonia, Greece, Hungary, Kosovo, Moldova, Poland, Romania, Russia, Serbia, and the country formerly known as Yugoslavia); North America (including Canada and continental and insular USA); Latin America and the Caribbean (including Argentina, Brazil, Chile, Colombia, Ecuador, Panama, and Peru, as well as overseas departments of France, including French Guyana and the French West Indies); the Middle East and Africa (including Egypt, Iran, Israel, Jordan, Kuwait, Libya, Malta, Qatar, South Africa, Turkey, and the United Arab Emirates, as well as the overseas department of France, Réunion); Asia and Pacific Islands (including Fiji, India, Japan, the People’s Republic of China, the Republic of China (Taiwan), and the Republic of Korea).