Assay of Advanced Glycation Endproducts (Ages): Surveying Ages by Chromatographic Assay with Derivatization by 6-Aminoquinolyl-N-Hydroxysuccinimidyl-Carbamate and Application to N∊-Carboxymethyl-Lysine- and N∊-(1-Carboxyethyl)Lysine-Modified Albumin