Before 9 Sudoku (132)

Instruction:

Apply Classic Sudoku rules. Additionally, the clues outside the grid show the sum of the digits that appear before 9 in the corresponding row or column.

Reference: WPF (1)

Examples:

WPF Sudoku GP 2015 - Round 2 (43)

Parent puzzle:
Sudoku

Child puzzles:
Before 1 - After 9 Sudoku