* Weaker China sales to hurt profit in second half

* Blackmores says it is reviewing operations in China

* Shares mark biggest daily percentage drop since 1985 listing (Recasts on China review, updates shares)

By Byron Kaye

SYDNEY, Feb 19 (Reuters) – Australian vitamin maker Blackmores Ltd said it would review its China business and issued a surprise profit warning, citing soft consumer demand on the mainland, sending its shares down the most since

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