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If a fielder is injured or turns into unwell throughout a match, a substitute is allowed to subject instead of him, however the substitute can't bowl or act as a captain, besides in the case of concussion substitutes in international cricket. The substitute leaves the field when the injured player is match to return. The Laws of Cricket have been up to date in 2017 to permit substitutes to act as wicket-keepers. The wicket-keeper and the batters wear protective gear due to the hardness of the ball, which could be delivered at speeds of more than one hundred forty five kilometres per hour and presents a serious health and security concern. These matches even have a match referee whose job is to ensure that play is inside the Laws and the spirit of the game. The inter-war years had been dominated by Australia's Don Bradman, statistically the best Test batter of all time. Test cricket continued to increase in the course of the 20th century with the addition of the West Indies ,