Table 2.

Expected sample size per study city.

Study city/region		Registered MisSAa(population statistics, 2010) [48]	Targeted minimum sample size
Rhine-Ruhr region			1000
	Essenb	8731	650
	Cologne	5438	350
Berlin		12,086	500
	Munich	7970	350
	Frankfurt am Main	5605	350
	Hanoverc	3377	350
Total			2550

^aMisSA: migrants from sub-Saharan Africa.

^bRecruitment in Essen (2229), Mulheim an der Ruhr (909), Oberhausen (911), Duisburg (1571), and Düsseldorf (3111).

^cRecruitment in the administrative districts Hanover Region (2554), Hildesheim (239), and Brunswick (584).