Physical gold ETFs retreated over the past week. That situation has been particularly onerous for gold mining equities and ETFs. That's an asset class known for overshooting the yellow metal's moves in both directions. However, there could be a golden lining, pun intended. Gold's recent pullback is arguably healthy. That's because the commodity's scorching run this year and the aforementioned retrenchment in mining stocks could open the door to opportunity with the WisdomTree Efficient Gold Plus Gold Miners ...