2321529 MALDI matrix-assisted laser desorption/ionization 2865 2069091 AP-MALDI matrix-assisted laser desorption/ionization 12 3487249 AP-IR-MALDI matrix-assisted laser desorption/ionization 4 3564205 AP-SMALDI matrix-assisted laser desorption/ionization 2 2289922 MADLI matrix-assisted laser desorption/ionization 1 2104199 MALD/I matrix-assisted laser desorption/ionization 1