Napitupulu, Anwar, Rehmamana Sembiring, Chairuddin Lubis, S.M. Manoeroen, and Helena Siregar. 2017. “The Micro Erythrocyte Sedimentation Rate (ESR) Among Chiidren of the Tobacco Plantation Laborers in North Sumatra”. Paediatrica Indonesiana 19 (11-12), 302-7. https://doi.org/10.14238/pi19.11-12.1979.302-7.