To analyze Telomere length, 10-milliliter (ml) blood samples from caregivers will be collected in a heparinized glass before and after the intervention. The white blood cells (leukocytes) are isolated and frozen to - 80 degrees Celsius. Blood samples are taken before randomization and after termination of the intervention. When the investigation is complete and all blood samples have been obtained and frozen, we will follow a standard protocol for isolation of telomere DNA. This protocol describes how DNA is analyzed for TL in the leukocytes by using a quantitative polymerase chain reaction (PCR), and how the total average TL is calculated from both the amount of telomeric product, and each copy gene.