user: Question: What is the round of 16 result for Jiske Griffioen Esther Vergeer?
Columns: ['Athlete', 'Class', 'Event', 'Round of 32', 'Round of 16', 'Quarterfinals', 'Semifinals', 'Final/ Bronze medal match']
Types: ['text', 'text', 'text', 'text', 'text', 'text', 'text', 'text']
Sample row: ['Monique de Beer', 'Open', 'Mixed Quad Singles', 'N/A', 'Norfolk ( GBR ) L 1-6, 1-6', 'Did not advance', 'Did not advance', 'Did not advance']
SQL:

assistant: SELECT "Round of 16" FROM "Table" WHERE "Athlete" = 'Jiske Griffioen Esther Vergeer';