If the legislation of a Member State subordinates recognition of entitlement to a benefit to the completion of a minimum period of insurance during a determined period preceding the contingency insured against (reference period) and lays down that periods during which benefits were paid under the legislation of that Member State or periods devoted to child-rearing in the territory of that Member State shall extend this reference period, the periods during which invalidity or old age pensions or sickness, unemployment, industrial accidents at work or occupational disease benefits were paid under the legislation of another Member State and periods devoted to child-rearing in the territory of another Member State shall also extend this reference period.