Determination of tumor necrosis factor (TNF±) levels in the synovial fluid of metacarpophalangeal joints in polo ponies - Rasera, Luciane; Gomes, Cristina de Oliveira Massoco-Salles; Foz Filho, Roberto Pimenta de Pádua; Baccarin, Raquel Yvonne Arantes (Congress of the World Equine Veterinary Association, 2006)