Laboratory protocol for the digital multiplexed gene expression analysis of nasopharyngeal swab samples using the NanoString nCounter system [version 2; peer review: 2 approved] oleh Marilina García Aranda, Susana García-Gutiérrez, Inmaculada López-Rodríguez, Isabel Barragan-Mallofret, Martina Álvarez, Maximino Redondo, Vanessa de Luque, Maria Padilla-Ruiz, Tatiana Diaz, Maria Luisa Hortas