Table:
text: 2002 Vuelta a España
Jersey Progress
Jersey Progress
Stage Winner General_classification Points_classification Mountains_classification Combination_classification Team_classification
17 Angelo Furlan Roberto Heras Erik Zabel Aitor Osa Roberto Heras Kelme-Costa Blanca
18 Santiago Blanco Roberto Heras Erik Zabel Roberto Heras Roberto Heras Kelme-Costa Blanca
19 Jose Vicente Garcia Acosta Roberto Heras Erik Zabel Aitor Osa Roberto Heras Kelme-Costa Blanca
20 Angelo Furlan Roberto Heras Erik Zabel Aitor Osa Roberto Heras Kelme-Costa Blanca
21 Aitor González Aitor González Erik Zabel Aitor Osa Roberto Heras Kelme-Costa Blanca

text: 2002 Vuelta a España
Jersey Progress
Jersey Progress
Stage Winner General_classification Points_classification Mountains_classification Combination_classification Team_classification
1 ONCE-Eroski Joseba Beloki no award no award Joseba Beloki ONCE-Eroski
2 Danilo di Luca Joseba Beloki Danilo di Luca Mederic Clain Vitoriano Fernandez ONCE-Eroski
3 Mario Cipollini Joseba Beloki Erik Zabel Mederic Clain Mederic Clain ONCE-Eroski
4 Mario Cipollini Joseba Beloki Erik Zabel Mederic Clain Vitoriano Fernandez ONCE-Eroski
5 Guido Trentin Mikel Zarrabeitia Erik Zabel Mederic Clain Guido Trentin ONCE-Eroski
6 Roberto Heras Óscar Sevilla Erik Zabel Mederic Clain Félix Garcia ONCE-Eroski
7 Mario Cipollini Óscar Sevilla Erik Zabel Mederic Clain Félix Garcia ONCE-Eroski
8 Aitor González Óscar Sevilla Erik Zabel Gilberto Simoni Óscar Sevilla ONCE-Eroski

text: 2002 Vuelta a España
Jersey Progress
Jersey Progress
Stage Winner General_classification Points_classification Mountains_classification Combination_classification Team_classification
9 Pablo Lastras Óscar Sevilla Erik Zabel Gilberto Simoni Óscar Sevilla ONCE-Eroski
10 Aitor González Óscar Sevilla Erik Zabel Gilberto Simoni Óscar Sevilla Kelme-Costa Blanca
11 Pablo Lastras Óscar Sevilla Erik Zabel Gilberto Simoni Óscar Sevilla Kelme-Costa Blanca
12 Alessandro Petacchi Óscar Sevilla Erik Zabel Gilberto Simoni Óscar Sevilla Kelme-Costa Blanca
13 Giovanni Lombardi Óscar Sevilla Erik Zabel Gilberto Simoni Óscar Sevilla Team Coast
14 Sergei Smetanine Óscar Sevilla Erik Zabel Gilberto Simoni Óscar Sevilla Team Coast
15 Roberto Heras Roberto Heras Erik Zabel Gilberto Simoni Roberto Heras Kelme-Costa Blanca
16 Santiago Botero Roberto Heras Erik Zabel Aitor Osa Roberto Heras Kelme-Costa Blanca

Question: What is the minimum stage at the 2002 Vuelta a España where the mountains classification is Aitor Osa and Aitor González won?