(a).

Year	Study	Study design	Number of patients	Type of PRP	Activation
2011	Koji et al. [42]	Prospective preliminary trial	6	P-PRP releasate	CaCl2+autoserum
2014	Bodor et al. [44]	Case series	35	P-PRP	None
2016	Navani and Hames [45]	Case series	6	L-PRP	None
2016	Levi et al. [46]	Prospective trial	22	L-PRP	None
2016	Tuakli-wosornu et al. [47]	Double-blind randomized	36 treatments and 22 controls	L-PRP	None
2017	Akeda et al. [43]	Prospective trial	14	P-PRP	CaCl2+autoserum
2018	Lutz [48]	Single case report	1	L-PRP	None