EMS, Merck Sharp & Dohme Farmacêutica, Laboratórios Pfizer, Novartis Biociência and several other market players have been queried by the Brazilian competition authority about proper market definition in its review of União Química's planned buyout of Bayer's contraceptive business.União Química aims to acquire Bayer's Schering do Brasil Química e Farmacêutica, as well