Serum Neuropeptide Y Levels Are Associated with TNF-α Levels and Disease Activity in Rheumatoid Arthritis oleh Melissa Ramirez-Villafaña, Ana M. Saldaña-Cruz, Javier A. Aceves-Aceves, Edsaul E. Perez-Guerrero, Nicté S. Fajardo-Robledo, Edy D. Rubio-Arellano, Cesar A. Nava-Valdivia, Maria O. Carrillo-Escalante, Sylvia E. Totsuka-Sutto, David Cardona-Müller, Betsabe Contreras-Haro, Mario Salazar-Paramo, Ernesto G. Cardona-Muñoz, M. Huerta, Jorge I. Gamez-Nava, Norma A. Rodriguez-Jimenez, Laura Gonzalez-Lopez