Combing the medical histories of 89,576 identical and fraternal twins from Sweden, Denmark and Finland,they got reliable enough statistics to analyze 11 types of cancers.

• 他们从瑞典、丹麦和芬兰89576例同卵或异卵双生的医学纪录中，找到了足够的统计数字，对11种癌症进行分析；