Now I did, though no statistics.
European Roma Rights Centre [pdf!]:
12 December 2006 WRITTEN COMMENTS OF THE EUROPEAN ROMA RIGHTS CENTRE AND VZÁJEMNÉ SOUITÍ CONCERNING THE CZECH REPUBLIC FOR CONSIDERATION BY THE UNITED NATIONS COMMITTEE ON THE ELIMINATION OF RACIAL DISCRIMINATION AT ITS 70th SESSION ...Nevertheless, certain categories of persons - most notably anyone who left the country for any period of time between 1993 and 1999 - are still excluded from access to citizenship other than via naturalization procedures. This group includes persons who went to Slovakia for medical treatment or to give birth among relatives because at that time they had no access to any citizenship, or only to Slovak citizenship. In addition, those Roma who were forced to become "Slovaks" as a result of the Czech citizenship law may today face systematic discrimination as a result, for example, of local rules denying families social housing where one member of the family is a "foreigner" or similar. The Czech government has never undertaken any serious study of the situation of persons forced to be "Slovaks" as a result of the 1993 citizenship law and the current situations of exclusion they may be facing now, and so no policy measures exist to address these problems.
...Nevertheless, certain categories of persons - most notably anyone who left the country for any period of time between 1993 and 1999 - are still excluded from access to citizenship other than via naturalization procedures. This group includes persons who went to Slovakia for medical treatment or to give birth among relatives because at that time they had no access to any citizenship, or only to Slovak citizenship. In addition, those Roma who were forced to become "Slovaks" as a result of the Czech citizenship law may today face systematic discrimination as a result, for example, of local rules denying families social housing where one member of the family is a "foreigner" or similar. The Czech government has never undertaken any serious study of the situation of persons forced to be "Slovaks" as a result of the 1993 citizenship law and the current situations of exclusion they may be facing now, and so no policy measures exist to address these problems.