All Odd/Even Sudoku (125)

Instruction:

Apply Classic Sudoku rules. Additionally, within each region, the digits in the grey cells are either all odd or all even.

Reference: WPF (1)

Examples:

WPF Sudoku GP 2015 - Round 1 (13)

Parent puzzle:
Odd/Even Sudoku

Child puzzles:
Parity Sudoku