Coder instructions
If using a modern method (V313=3), then set to V326; else if V377 is a valid value (not equal to missing, NA, or 98), then set to V377; else the literal question is asked. If the literal question was not asked (due to skip pattern bypassing it), then if the filter question's response was missing, V379 will be set to missing; otherwise, it will be set to 98 (don't know).