The next tweet say:
Deale A, Chalder T, Marks I, et al. Am J Psychiatry. 1997;154(3):408-14. Sharpe M, Hawton K, Simkin S, et al. BMJ. 1996;312(7022):22-6. The PACE trial: White PD, Goldsmith KA, Johnson AL, et al. 2011;377(9768):823-36.
I just asked for the source and see you have done so too...