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EUR-Lex -  61990CC0253 - EN - Opinion of Mr Advocate General Lenz delivered on 19 September 1991. - Commission of the European Communities v Kingdom of Belgium. - Social security - Deduction of sickness insurance contributions from supplementary pensions or any other advantage replacing a statutory old-age, retirement, service-related or survivor's pension - Persons residing in a Member State other than Belgium. - Case C-253/90.