My impression is that this move nowadays is more popular than the Panno Variation with 7...a6. As a side note, in 10 days GM Oscar Panno, the Argentine legend, will celebrate the 70th anniversary of his World Junior title. Congratulations $1
1. c2c4  1... g8f6  2. b1c3  2... g7g6  3. g2g3  3... f8g7  4. f1g2  4... e8g8  5. d2d4  5... d7d6  6. g1f3  6... b8c6  7. e1g1 