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APA Citation
Cai, Z., Klein, T., Geenen, L., Tu, L., Tian, S., Van Den Bosch, A., De Rijke, Y., Reiss, I., Boersma, E., Duncker, D., Boomars, K., Guignabert, C., & Merkus, D. (n.d.). lower plasma melatonin levels predict worse long-term survival in pulmonary arterial hypertension. European heart journal, 41, . http://access.bl.uk/ark:/81055/vdc_100115126432.0x000055