| 1. | Introduction | 1772 |
| 2. | Contrast Agents (CAs) for MRI: Gd-based complexes | 1773 |
| 2.1. CAs derived from acyclic ligands | 1774 | |
| 2.2. CAs derived from macrocyclic ligands | 1784 | |
| 3. | Concluding remarks and future perspectives | 1790 |
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